Very unique issue with Extensions and Add-ons! - Garry's Mod

I have bought Gmod 10 with Half-Life 2:Deathmatch, and also recently downloaded the free version of Portal as well. I quickly learned that Portal is not a game that wants to run on my system from 2005. Gmod worked before the download, and wouldn't after. I transferred all of my Steam information onto my secondary drive, and uninstalled them on my C drive. The client and all of the game information is now on my E drive, and problems hadn't occurred until recently. The main problem is that my Portal game won't start up, and gives a reference error. This shouldn't be a problem, because I could just take it out of the extensions and add-ons, right? No! I checked my Extensions and Add-ons, and my HL2:DM apparently no longer exists to Gmod. I looked through my files, and both Gmod and Portal have a "content.gcf" file, but the one that is missing. This wouldn't be a problem, except because it's running off of the non-working Portal, it gives the same error! My question is this: What on Earth can I do to re-add it back into my Extensions list? And yes, I have played it. 8 hours of it, to tell the truth. And my Gmod worked before all of this, too. Note: My system information is:Summary Operating System MS Windows XP Home 32-bit SP3 CPU Intel Celeron Northwood 0.13um Technology RAM 512MB DDR @ 132MHz (2-2-2-6) Motherboard Dell Computer Corp. 0F5949 (Microprocessor) Graphics LCD1970NX @ 1280x1024 Intel(R) 82845G/GL/GE/PE/GV Graphics Controller Hard Drives 195GB Seagate ST3200827A (ATA) 36 °C 39.1GB Western Digital WDC WD400BB-75JHC0 (IDE) 33 °C Optical Drives TigerJet CD-ROM USB Device HL-DT-ST CD-RW GCE-8483B HP DVD Writer 840b Audio USB Audio Device Operating System MS Windows XP Home 32-bit SP3 Installation Date: 10 May 2005, 17:21 Serial Number: RCBF6-6KDMK-GD6GR-K6DP3-4C8MT CPU Intel Celeron Cores 1 Threads 1 Name Intel Celeron Code Name Northwood Package Socket 478 mPGA Technology 0.13um Specification Intel(R) Celeron(R) CPU 2.40GHz Family F Extended Family F Model 2 Extended Model 2 Stepping 9 Revision D1 Instructions MMX, SSE, SSE2 Bus Speed 99.7 MHz Rated Bus Speed 398.8 MHz Stock Core Speed 2400 MHz Stock Bus Speed 100 MHz Caches L1 Data Cache Size 8 KBytes L1 trace cache 12 Kuops L2 Unified Cache Size 128 KBytes Core 0 Core Speed 2392.2 MHz Multiplier x 24.0 Bus Speed 99.7 MHz Rated Bus Speed 398.8 MHz Thread 1 APIC ID 0 RAM Memory slots Total memory slots 2 Used memory slots 2 Free memory slots 0 Memory Type DDR Size 512 MBytes DRAM Frequency 132.9 MHz CAS# Latency (CL) 2 clocks RAS# to CAS# Delay (tRCD) 2 clocks RAS# Precharge (tRP) 2 clocks Cycle Time (tRAS) 6 clocks SPD Number Of SPD Modules 2 Slot #1 Type DDR Size 256 MBytes Manufacturer MOSEL Max Bandwidth PC3200 (200 MHz) Part Number V826632K24SCTG-D3 Serial Number E2513464 Week/year 05 / 05 SPD Ext. EPP JEDEC #3 Frequency 200.0 MHz CAS# Latency 3.0 RAS# To CAS# 3 RAS# Precharge 3 tRAS 8 Voltage 2.500 V JEDEC #2 Frequency 166.7 MHz CAS# Latency 2.5 RAS# To CAS# 3 RAS# Precharge 3 tRAS 7 Voltage 2.500 V JEDEC #1 Frequency 133.3 MHz CAS# Latency 2.0 RAS# To CAS# 2 RAS# Precharge 2 tRAS 6 Voltage 2.500 V Slot #2 Type DDR Size 256 MBytes Manufacturer MOSEL Max Bandwidth PC3200 (200 MHz) Part Number V826632K24SCTG-D3 Serial Number 9524080A Week/year 41 / 05 SPD Ext. EPP JEDEC #3 Frequency 200.0 MHz CAS# Latency 3.0 RAS# To CAS# 3 RAS# Precharge 3 tRAS 8 Voltage 2.500 V JEDEC #2 Frequency 166.7 MHz CAS# Latency 2.5 RAS# To CAS# 3 RAS# Precharge 3 tRAS 7 Voltage 2.500 V JEDEC #1 Frequency 133.3 MHz CAS# Latency 2.0 RAS# To CAS# 2 RAS# Precharge 2 tRAS 6 Voltage 2.500 V Motherboard Manufacturer Dell Computer Corp. Model 0F5949 Chipset Vendor Intel Chipset Model i845G Chipset Revision A1 Southbridge Vendor Intel Southbridge Model 82801DB (ICH4) Southbridge Revision 01 BIOS Brand Dell Computer Corporation Version A05 Date 12/02/2003 Graphics Monitor Name LCD1970NX on Intel 82845G/GL/GE/PE/GV Graphics Controller Current Resolution 1280x1024 pixels Work Resolution 1280x982 pixels State enabled, primary, output devices support Monitor Width 1280 Monitor Height 1024 Monitor BPP 32 bits per pixel Monitor Frequency 75 Hz Device \\.\DISPLAY1\Monitor0 Intel(R) 82845G/GL/GE/PE/GV Graphics Controller Memory 64 MB Memory type 2 Driver version 6.14.10.4342 Hard Drives ST3200827A Manufacturer Seagate Form Factor 3.5" Interface ATA Serial Number 5ND3A4HW Capacity 195GB Real size 200,049,647,616 bytes S.M.A.R.T 01 Read Error Rate 114 (094 worst) Data 0004744571 03 Spin-Up Time 098 (097) Data 0000000000 04 Start/Stop Count 098 (098) Data 00000008C3 05 Reallocated Sectors Count 100 (100) Data 0000000000 07 Seek Error Rate 084 (060) Data 00103C4879 09 Power-On Hours (POH) 092 (092) Data 0000001D4F 0A Spin Retry Count 100 (100) Data 0000000000 0C Device Power Cycle Count 099 (099) Data 00000005F8 BB 100 (100) Data 0000000000 BD High Fly Writes (WDC) 100 (100) Data 0000000000 BE Temperature Difference from 100 065 (054) Data 00241E0023 C2 Temperature 035 (046) Data 0000000023 C3 Hardware ECC Recovered 063 (055) Data 00049DBE83 C5 Current Pending Sector Count 100 (100) Data 0000000000 C6 Uncorrectable Sector Count 100 (100) Data 0000000000 C7 UltraDMA CRC Error Count 200 (200) Data 0000000000 C8 Write Error Rate / Multi-Zone Error Rate 100 (253) Data 0000000000 CA Data Address Mark errors 100 (253) Data 0000000000 Temperature 36 °C Temperature Range ok (less than 50 °C) Status Good Partition 0 Partition ID Disk #1, Partition #0 Disk Letter E: File System NTFS Volume Serial Number F055B263 Size 186GB Used Space 27.3GB (15%) Free Space 159GB (85%) WDC WD400BB-75JHC0 Manufacturer Western Digital Form Factor GB/2.5-inch Serial Number WD- WMAMA3440841 Interface IDE Capacity 39.1GB Real size 40,000,000,000 bytes S.M.A.R.T 01 Read Error Rate 200 (200 worst) Data 0000000000 03 Spin-Up Time 166 (164) Data 0000000A8C 04 Start/Stop Count 099 (099) Data 0000000790 05 Reallocated Sectors Count 200 (200) Data 0000000000 07 Seek Error Rate 200 (200) Data 0000000000 09 Power-On Hours (POH) 086 (086) Data 00000028E7 0A Spin Retry Count 100 (100) Data 0000000000 0B Recalibration Retries 100 (100) Data 0000000000 0C Device Power Cycle Count 099 (099) Data 0000000778 C2 Temperature 110 (097) Data 0000000021 C4 Reallocation Event Count 200 (200) Data 0000000000 C5 Current Pending Sector Count 200 (200) Data 0000000000 C6 Uncorrectable Sector Count 200 (200) Data 0000000000 C7 UltraDMA CRC Error Count 200 (200) Data 0000000000 C8 Write Error Rate / Multi-Zone Error Rate 200 (200) Data 0000000000 Temperature 33 °C Temperature Range ok (less than 50 °C)

Try reinstalling. What do you mean by 'free'?

[QUOTE=Biotoxsin;25430396]Try reinstalling. What do you mean by 'free'?[/QUOTE] When I say "free," I meant the free Portal download thing that was on a couple months ago or so. I figure it lacks something, even though I have un-installed and re-installed it multiple times.

How did you play anything with so little RAM... :ohdear: Try increasing your paging file a bit.

[QUOTE=DatMeg;25432521]How did you play anything with so little RAM... :ohdear: Try increasing your paging file a bit.[/QUOTE] Thanks for reading through that wall of text, but my paging file amount is around 4 gigs.

You're trying to run garrysmod on an old Dell from 2005. The issue isn't garrysmod, exensions or addons. It's your computer.

[QUOTE=CAPSMAN!;25433045]You're trying to run garrysmod on an old Dell from 2005. The issue isn't garrysmod, exensions or addons. It's your computer.[/QUOTE] Actually, it's run really well before. If you look at my Steam profile, you'll see I spent some hours playing it. It worked well up until recently.

When was the last time you played garrysmod without problems?

[QUOTE=CAPSMAN!;25434773]When was the last time you played garrysmod without problems?[/QUOTE] Let's see... ...around half of a year. Why? BTW, the reason it's so long is because I stopped playing for a couple of months, then when I tried, it didn't work. It's always giving me some reference issue, even though I've uninstalled and reinstalled like 3 times for each game, played Portal and HL2:DM and then Garry's Mod.

There's been a lot of changes to garrysmod over the past six months. Your computer can't run this game anymore I'm afraid.

You shouldent even been able to run garrysmod with that computer since long ago, you was very lucky it worked half a year ago

[QUOTE=Tobba;25448332]You shouldent even been able to run garrysmod with that computer since long ago, you were very lucky it worked half a year ago[/QUOTE] I just checked. My computer has ALL of the minimum requirements for all 3 games. So it's not that.