computer is slow and shuts down in stead of standby

[Sklomp]

The computer i am talking about is my personal pc, it has an i7-2600, 6gb ram, gt520 and a 500gb 7200rpm+ 1tb 5400rpm(green). It runs windows 8 pro 64-bit. 

It was running pretty good, but recently it just started to act weird. It is very slow sometimes, even on a fresh bootup.

For some time i didn't put it into sleep because it has a psu that is very sensitive for the rough power we sometimes have. I now have it running with a ups in front of it. 

When i select the option that it has to go in standby it inmediately disables the gpu, but then after 5 minutes it still isn't in stanby but turns off. When I boot my system back up it says that something went wrong, but no error code or something, just that it wants to report my information to microsoft (no way I'm going to do that).

 

Do you guys (or girls) have any solution for this problem, I am pretty sure I don't have a virus or anything like that, but I am running malwarebytes again. (do it every saterday-sunday)

[Darell3]

Do you have the latest updates for win8?

[Sklomp]

Yes i do, the problems with standby started after that. It was my first time updating it because there where some important updates with it (lan and audio drivers). I am thinking of restoring it to before the updates but then I have to reïnstall some games and that sucks

[Darell3]

Here check this link out.

[Sklomp]

Well i put it manually in standby because i hate it when it goed into standby automatically because that ruins flash player if I am playing a movie using youtube. Adjusting how it goes automatically into sleep isn't the answer unfortunately

[virusal19]

Any weird sounds coming from your hard drive?

 

Performance lost and unexpected errors of problems can happen due to a dying HDD.

[Sklomp]

I just checked crystaldiskinfo, and like I thought there are no issues with the hdd, both show up labeled as good.