Are my suggestions listed above not helping you?
Can you please give me the following information:
Which operating system, which service packs, additions, with/without Admin rights?
Size of RAM
Graphics card and driver version
additional hardware - driver versions
additional software running in the background (e.g. virtual drives? Anti virus programs, Internet, Firewall etc?)
Sound card and driver version
Size of swap file (regulated by OS or by fix value you put in?)
Game version and patch (e. g. clean install 1.029 + 1.033 or 1.029 + 1.032 + 1.033 later on?)
size of partition/hard drive, free space left
DirectX version
colour depth 16 bit or 32 bit?
additionals: have you used a fix download before (Raze's zip files eg.), used the hex editor, No-CD-Crack, Zakaron's game editor etc?
exact description of the problem you are encountering