I just installed Norton Utilities 15 on Win7 x64 and defragged the Win7x64 drive with it. In the middle of the process, Windows changes to the dreaded Black Screen and tells me it is not longer genuine. Arrgghhh. I download the program from MS to "resolve" it, and it apparently fixed it, deciding Windows was indeed genuine.
I have several OSes installed here (XP 32 and x64, both versions of Win7 and others) and have NU 15 installed under XP and everything seems to run fine. I've even defragged the Win7 partitions from under XP with no problems. But lo and behold, I run it from under Win7 itself and this happens.