Hi there,
SO it seems after updating ie6 to ie8 ur not ablr to open the browser but the firefox works fine...ok
Lets try this
1.click start>run and type inetcpl.cpl
2.If u get a window then go to the tab>advanced and at the bottom click restore defaults and click apply
3.Go to programs tab and click reset web settings and click apply
4.now click start>run and type iexplore
www.yahoo.com and see whether it works
5.If none of these works go to control panel>add remove programs>add remove windows components and uncheck IE which will uninstall it
6.restart ur computer once and go to same place and check IE and it will install it see whether u can use IE after re-installing.
Good Luck