Black box after install Mountain Lion

I just installed OSX Mnt Lion (10.8)e on a MacBook Pro (mid 2011,Intel HD Graphics 288 MB) 15", 2.4 IntelCore i5 and now have a black box about 1/4 the size of the screen. It appears in the left hand corent right before the default screen appears and does not go away.I have tried reinstalling, chaning resolution and deinstalling the Microsoft mouse software and its still there. Any ideas?

Appreciate you guys replying!
Both, to answer you question. When I installed ML, MAC OS booted up vs Vista if I just turned laptop on. That was ok as I just held "OPT" key and booted Vista if needed. Since I had the problem I changed that to boot-up Vista w/o using OPT key. Tried w/ original Vista install CD installed during boot and not installed. No difference. Not able to even start in SAFE mode. It is as if the PC side of the partition does not exist although I can pull up files if MAC is booted-up and I enter Bootcamp through "Finder".

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