Computer is sick, perhaps dying

[green tea]

Hello I have this problem:

My computer is not working correctly anymore. I did not change anything except that I ran UltraDefrag. Now Napoleon does not start anymore, and "Sins of a Solar Empire" starts, but after some time shuts down without any error message.

There was actually a message after I tried to run Napoleon, but when I tried to find it, there were not enough "system resources" to show anything. I will try to find it, but before my computer shuts down again, I have to post this.

I assumed it could be the HDD. So if you know something about computers, how can I check that? I ran chkdsk, it found no errors (and took two hours, so I would like to try something else).

I am sorry if I can´t describe all that better. Do you have any idea what it could be and with which program I could find that out?

[Swagger]

im no hardware genius, but if i were you i would reformat your pc and install a fresh windows

[Ishan]

Do a windows restore to a time when everything worked fine, if that doesn't helps then do like Swagger said and if that doesn't helps then something is wrong in hardware.