First, you should make sure your anti-virus and spyware/adware scanner software are all up to date. If you haven’t updated in awhile or aren’t sure if you are set to auto update, go ahead and update the software and run a full system scan again. If you are still having problems you may have registry errors on your machine. Over time, ALL computers develop errors. This is generally caused from installing and uninstalling programs. Fragments can be left behind and over time registry entries can become corrupted. There are some great programs that not only scan for these errors, but also fix them.