Unable to play on servers

Processor : AMD Athlon 64 X2 Dual Core Processor 5200+, 2712 MHz
RAM: 2Gb
Graphics card : NVIDIA GeForce 9600 GT
Operating system: Windows XP 32-bit

hi, i am unable to play on servers because when i’m finished loading all the fils and join the server i find myself half in the ground and (sometimes) canot move even when i go in "noclip"mode and all the other player are little blue lights (physgun end) moving aroun. For additional info , i only have the physgun, camera and tool weapon and can spawn props but not move them. What can i do tho resolve this ?

THX in advance.

First of all, go to the right freaking board.
Second of all, go to the right freaking board.
Third of all, refer to step one and two.

euhm ok , don’t quit understand but i’ll try.