Most all of us agree that an upgrade is not the route to take. It leaves useless files on your system and can cause conflicts which you are now experiencing
Save all you Documents, Pictures, contacts, videos, music, etc to a flash drive,
Be aware, you will need to re-install your 3rd party applications.
The next blue screen that occurs, look in the C:\windows\minidump folder and upload the .dmp file here.
There i poll going on now and "clean" install is winning by a mile.
At present, I've also had a problem with one of my flash drives. In going back and forth from my laptop (Windows Vista Home Premium 64-Bit) to my desktop post upgrade. I lost nearly everything in the drive itself
Could you elaborate on this...