Download the Windows Installer Cleanup Utility here
http://download.microsoft.com/downlo...bd/msicuu2.exe and lets see if there is anything in here causing the Windows Installer to popup.
Now for the internet connectivity issue please download and run this tool
http://www.dslreports.com/r0/downloa...WinsockFix.zip let me know if you have any questions.
Do not forget to be working with a user that has admin rights.