On January 28th, 2009 my Vista Business computer updated it's definitions and scanned usp10.dll and quarantined the file. My computer then rebooted and could not finish rebooting. I received a blue screen stating that usp10.dll could not be found after every attempt to reboot. To resolve this, I copied usp10.dll from my other home computer (vista home premium) and pasted in the Windows/System32 directory. Since I could not boot into Vista, I had to take the following steps to do this: 1. Download and burn Knoppix. Knoppix is a Linux OS that you can run from a cd. 2. Boot your computer from your CD Drive with the Knoppix cd in the drive. 3. Specify your C Drive and set it is a writable drive. (Note: Your C Drive Won't be labeled C in Knoppix. You will have to look through the mounted drives in Knoppix to find it) 4. Copy the USP10.dll file from your extneral hard drive/jump drive to your C Drive. You will need the following resources to do this: 1. A knoppix distribution which is free at: from http://www.knopper.net/knoppix/index-en.html. 2. A CD Burner with ISO burner software to burn Knoppix. 3. Knowledge of how to boot from a CD. (Your computer's user documentation should tell you how to do this. 4. The USP10.dll (Can come from another computer running the same OS or be downloaded from the internet or another .) I feel more comfortable getting it from another Computer. 5. An external hard drive or USB drive to copy the dll to your computer. I hope this will help someone out there!