Bug/ Error help, please!

I just downloaded Gmod two days ago, and when it finished I hopped on, selected singleplayer, and the map flatgrass. During the loading screen I recieved this error:

I have tried everything, (yes, that tutorial on Steam too,) and I’m just wondering if my computer could even * run* Garry’s Mod at all.

Windows XP Home Edition, Version 2002, Service Pack 3.

Pentium 4 CPU 2.40 GHz
2.39 GHz, 1.00 GB of RAM

All help appreciated.

Try running it in windowed mode, if that doesn’t work then try removing the garrysmod folder and running it, it will cause garrysmod to reset itself to original incase the problem was that it installed wrong

You didn’t list your graphics card, but I get the feeling it’s an integrated intel card that’s as antiquated as your processor.
I have no clue why you’re trying to game on a Pentium 4, or 1 gig of ram for that matter.
This is a hardware issue.

processor isn’t alright

1 gb ram is very bad

Eh I used to run gmod on a P4, but then again I did have a decent graphics card.

It could be your RAM, since you have 1gb, also, post your graphic card.