okay so i was playin like always counter strike source it always crashes for some reason after 1 hour after i found out that no one know whats the problem i learned to live with it so all i do is play the hour wait for it to crash and of course crash the computer too then i manualy restart my computer and play again it all went well until right now when it crashed i manualy restarted my computer but when it open it said it had some error opening my profile and then the computer opened like if i just reinstalled my windows no desktop no history no shortcuts but the programs were still there and also a little note some of the shortcuts were still there so how did this happen?

System Restore
--------------------------------------------------
You might try a System Restore to a point prior to your problem:

start > All Programs > Accessories > System Tools > System Restore

what does prior means ?

Before.

Restore it to yesterday for example.

impossible there is no any checkpoints until the point where it did what it did

Well that is not good.

First off right click My Computer then click Properties then System Restore

Turn it off then turn it back on. This will reset it for the future.

Next reboot to the Safe Mode option screen by tap tap tapping F8 between the BIOS or logo screens but before XP tries to start.

From the options choose: Last Known Good Configuration

okay so latest news is i tried what u previosly said and it didnot work but now the problem is gettin worse b4 i restarted my computer i added some shortcuts and stuff and when it restarted voila i didnot find a single thing its like the computer got no memory ohh and by the way whenever i open the computer i get this error from user enviroment saying sth like " ur profile could not be loaded because of security rights and more reasons i cannot remeber and then at the end it says contact ur adminstrator " security rights?
oh 1 last thing i beeeeeeeeeeeeeeg you please dont tell me reinstall ur windows cause i faced wierd problems with my winmdows including crashing and i reinstalled my windows at least 10 times in just 1 month i even bought a new copy coz myabe the other one had some thing wrong or sth but nothing happened i am gettin rlly mad

Well reinstalling is always just a last option. There are also many ways to do it but we can try other things first.

Is this XP Home or XP Pro?

this is pro

go to start Run... and type control userpasswords2

What shows up?