|This is a copy/paste from another question by *may* be helpful:|
If you don't have a cleaning program, install & run CCleaner-Slim. If you're the type that likes to store your passwords so that you don't have to log in to sites all the time, uncheck the box next to 'cookies' before running the program. I always uncheck the box next to Recycle Bin & empty it myself as I see fit, but that's up to you. Run the program, delete everything it finds.
Make sure to get the 'Slim" version.
When's the last time you scanned for viruses and spyware? Which anti-virus program are you running?