Good Evening Rainking, well that is certainly odd.
Johnwill has a USB refresh procedure that may well be worth trying
Alternatively, have you considered a malware possibility?
I find that using the Smartcop program is very useful to uncover odd problems in many machines.
http://www.s-cop.com/free-scanner.html
This is a small stand alone scanner that operates somewhat broader than an ordinary A/V.
It generally finds many odd suspects, but where it really becomes useful is running it with another decent A/V monitoring, this procedure commonly finds undetected programs, very often detected in the monitoring system, obviously by some unique effect from the smartcop scanner in progress..
I prefer to put it in a directory like C:\Smartcop so that it can easily be operated in safemode if neccessary.
If any detections are made I don't like deleting anything until I have determined what it is and what effect it may have produced.
This dual procedure regularly catches problems that major A/Vs have missed, it also often finds viral signatures within A/V systems which I don't believe should be present.
If we consider file corruption involvement, as apart from a buggy MS Update, it really doesn't leave much else for consideration, given that the system otherwise has absolute normal hard and software component integrity.
qldit.
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