IE and Firefox Will not open after installing NAV2009

I can not open IE and firefox after installing NAV 2009. 

 

I am using IE7, I uninstalled NAV2009, used the norton removal tool, and ran Winsockxpfix, am using Windows XP. 

 

I have an internet connection, I can ping websites, and can run msn messenger and run World of Warcraft.

 

Have been researching for hours.  All help is appreciated.