Create a Restore Point.
Right click Zapper/Properties, check "Run in XP compatibility mode". Run Zapper. Reboot. Download:
WWW Link and install as a trial- it is 64 bit compatible. (trial is 30 days full featured. If you don't like it at the end of trial, it un-installs clean.)
Open Windows Disk Cleaner, check them
all and delete.
Look to see what files Zapper left. Anything you find, delete. Empty Recycle Bin. Run Powertools, let it scan your system (if it didn't on the install), set it to create backups and run the 'Registry Cleaner'. Have it fix all the errors it finds (drop down menu- Select all/ hit Fix). Reboot.