Well, its very hard to say - could be a lot of things, but I'm betting on a browser related issue.
Whatever browser you are using, try XAMPP after freshly installing a new shine clean browser. Just make it a clean install of the browser, there are lots to pick from, so it shouldn't be all that hard. Just one that you DON'T have installed now.
If you are running IE and don't have Firefox, its the best choice
Chrome is cool, so is Safari - or go really different with Opera! - yeah different all righty , LOL.