Hi, do an SFC /scannow and replace any files that may be corrupt.
Otherwise click on start and run and type Msconfig hit enter. Click the startup tab and then uncheck half of the items listed. If the problem goes away you know its in that half if not then it could still be in the other half. So dianle the other half and see if disappears. If it does go away keep cutting the number of disabled items in half. You will eventually find out which app is causing it. When you do goto regedit and goto HKLM,software, Microsoft, windows, current version, run and locate the startup item there. Backup the key and then wipe out the line or you can just leave us disabled in Msconfig.
HTH