If the probleme still persisting please do the folowing steps in order to restor the Javascript registry environnement:

Go to start - Run => " regsvr32 jscript.dll "
Go to start - Run => " regsvr32 vbscript.dll "
Go to start - Run => " regsvr32 urlmon.dll "
Go to start - Run => " regsvr32 wshom.ocx "

If you need to remove IE8 :

Go to Start then Run : " %windir%\ie8\spuninst\spuninst.exe "

please postback so that we can share result

Good luck