Every game crashes to desktop

Based on what you have done so far,,,it seems like you have a memory related problem,as in no good or not getting enough power,you have not reported no hardware/software message errors so,,,,,try your ram in another machine??,give it a higher voltage setting ??,checked manfu's specs,tried memtest yet,,???..whoops!!! maybe those games do not support your card,,after all it isn't exactly the latest and greatest,,,,have you checked the readme that comes with said games ,,just to make sure,,,i mean hitman is a couple of years older than the rest,,,etc,,etc... 

Could be one of the following...

hard ware

heat - on processor - clean all the fins out - remove fan and heatsink - clean with brush and a can of compressed air...
re-seat it and test

power supply
Video card
Ram
Mobo


Try these.-- if the heatsink dont work - power supply is the cheaper option and usually fixes these

Software -

windows could be up the swanny, update bios, video, chipset and sound drivers..

I just have to say that I've just cleaned my compuer completely. The hardware isn't the problem I'm sure of it.

I had those games installed 3 months ago and played them, but I needed space on PC and deleted them all. It seems that I've installed something or done something wrong.

The hardware is not the problem. Before formatting they also worked fine... I'm thinking of another format, but it takes too much time and I'm lazy.

All of the drivers are updated to the lastest version. I've cleaned the computer with programs completely.

So any other ideas?

So if your sure its not the hardware and youve updated the video drivers then it could be something to do with copy protection software - have you loaded anything such as virtual dvd drives

Just a thought !!!

Hmm.. I think I found my problemo. It seems that I've have to get another thermal paste for my 2900 XT (I've cleaned it a week ago and removed some of the burned paste).

I'll tell you tomorrow how I've solved it.

You didnt tell us that bit did you ...

Hope it works...

About that bit... I've unloaded all of the drives