Woke up this morning to Prevx errors when booting up. It blocked c:\windows\system32\curslib.dll. Ran a full scan and it asked me to reboot. Problem still there when I booted up again. After other recent problems, I booted up on another clean disk and scanned that drive. Prevx found curslib.dll again. Since this was a free version of Prevx, I removed the file by hand. Booting up on the original drive, curslib is back. Something must be copying it into place upon bootup. I don't see anything in Start Menu/Programs/Startup, nor in msconfig/Startup.