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I have dual boot (Ubuntu and Win7) on my computer for 2 months. My computer is Sony VAIO VPCF22S1E. It has i7 CPU and 8GB RAM

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There is a weird slowness for a few months on Windows 7 OS. While using Ubuntu there isn't any slowness. But while i'm using Win 7 there is slowness.

Nod32 installed on my computer and i'm scanning my all devices on in-depth scan mode and there isn't any virus etc.

But on every Windows 7 startup i'm getting an "hKIow... (meanless chars) has stopped working" error. I have googled name of application (hKIow...) but there isn't any result.

Also i'm defragmenting my harddisk regularly .

I don't want to format my computer.

How you any idea for me ?

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It sounds like you are infected. The fact your computer is both slow and your getting an error means something is going on that isn't good. –  Ramhound Oct 18 '11 at 12:11
    
I'm using NOD32 . Which antivirus / antimalware should i use ? –  Eray Oct 18 '11 at 12:57
    
superuser.com/questions/100360/… A good start at removing malware –  Dave M Oct 18 '11 at 13:39
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It's not that NOD32 isn't working, it's that the virus may be capable of hiding itself in normal operation. All virus scanners are better border guards than internal police forces. –  music2myear Oct 18 '11 at 14:50
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Install Process monitor and enable boot logging, restart the PC and log into W7, then review the logs to see if you can nail down this random program, might be a leftover from malware removal.

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