After installing IE7, when i try to go on any website it launches a pop-up, stating "The requested look up key was not found in any activation context" and doesnt launch any webpages. Yet Mozilla Firefox works fine.
its the tabbing page of IE7 that is causing the upgraded IE6 to give the 'lookup key error'
Basically after installing xp pro, It runs like IE6, but with IE7 engine behind.
So the only solution is to uninstall IE7 manually to revert to IE6 interface:
see link below (method 2) :
To uninstall IE7 - :
Click Start, click Run, type %windir%\ie7\spuninst\spuninst.exe,
NB Uninstall it via Add/Remove Programs, click Show Updates and select Windows Internet Explorer 7.0. When you reinstall it, make sure you reboot immediately after you install.