Can’t access http sites

Running Windows XP SP2 and IE 6. For some reason I can not access any http sites and certain https sites. I had a problem with the install of my CA Internet Security suite and uninstalled as instructed and tried to install again and then this issue reared its ugly head during the re-install. Now I can’t get to any http sites. FTP and email still work OK. What needs to be done to remedy this issue?