Hi Ticker,
McAfee was probley a old version on the system before thats why it worked.
First try this link:http://service.mcafee.com/LocaleSelect.aspx?lc=1033&sg=TS&pt=1&st=CHATThings to try:1. Try and update Windows with all the latest updates
2. Try Update Internet Exporer to the latest version
3. Try and Update .net framework
4. Try and Update Java
5. Try run SFC /Scannow
Hope this helps you out