Hey, today i have reinstalled windows 7 fresh install.
how did you reinstall?......from a microsoft CD....or a factory recovery CD/HD recovery partition?

if from a recovery, does this also include reinstall of a factory installed antivirus?
if so, this must be uninstalled and run the vendors removal tool to clear any leftover files that may conflict
tools found here http://singularlabs.com/uninstallers/security-software/