Today my computer rebooted 3 times. First and second time ,when i tried to save the BIOS file,third when i tried to run GetSystemInfo from Kaspersky.Speaking of Kaspersky,my AV gone crazy.Updates stopped at 94%,couldn't disable it ,had to reboot.Every tim these things happened,i got this error log:
"The X4HSX32 service failed to start due to the following error: The system cannot find the path specified.
- EventData
param1 X4HSX32
param2 %%3 "

Might look at this for some clues . . .=)

For the BIOS thing, could be a safety reboot event you're tripping and forcing the reboots. Make sure you're doing it right but I just look at my settings and write them down as each time I save a BIOS it sucks. For the Kapersky I don't like modern AV programs. They are far too embedded into your OS anymore that one little bit of corruption of data can cause such problems you're having. I had a corrupted AV program called AVG do something similar to me.
Quick search turned this up:
The process X4HSX32 Kernel Mode Driver belongs to the software Exent EXETender for Win2K or Comcast Games on Demand Player by Exent Technologies Ltd.
That means you probably have software your AV has misidentified as a virus and is bugging, you have an incompatibility that's extremely rare or something else even less likely. If you can get past the error message and your PC acts normally AV-problems aside then that means your PC is letting you know this background program doesn't work anymore. If your PC doesn't run proper then your PC thinks this is a critical program.
Go to run and type "services.msc" without the quotes and look for this X4HSX32 program, disable it. Tell me how that works.
EDIT: Stuff you ninja'd me I looked on same website!

I got Ninja'd by Ralackk just yesterday . . . he is one of the best . . . =)

Is that metaboli related ? If it is, try to remove the games using the Exent player and redownload them, as i think they all use Yummy now.

"Go to run and type "services.msc" without the quotes and look for this X4HSX32 program, disable it. Tell me how that works."
didn't find anything
edit:
i don't have any games from Gametap or Metaboli

Now this gets deeper. Right so on services you didn't find the program which means it's not a background service. I could be a virus hiding as X4HSX32 since you don't have Gametap or Metaboli installed. There are many viruses that run as svchost.exe to hide themselves in the background programs. Can you log on to backup your data? If so do so before anything else, you may need a fresh reformat as that would be easier to do and give you a fresh PC. Even if you do not reformat you may lose some data. Also this might not be your root problem it could be an artifact of another more serious problem.
Kapersky, you say it won't update anymore? Try doing a scan to see what comes up, if there's problems then you can go from there on fixing the issue.

"Kapersky, you say it won't update anymore? Try doing a scan to see what comes up, if there's problems then you can go from there on fixing the issue."
the Kaspersky update problem solved,now running a full scan

Right. So if anything comes up try fixing the issue and see if your PC stabilizes. Me, and remember this is just me, if anything doesn't even behave half proper on my PC I just reformat it. I keep my critical files backed up on various media and the OS is a liquid concept as far as I'm concerned :)