Although you have uninstalled it three times, do a reset as Save suggested. There may be a misbehaving setting saved which will re-activate at the reinstall.
Also, there's a valid point in Lizard's post. If one browser works and another doesn't, it's in the settings. If neither works, it's somewhere in the Internet or network settings. Since Chrome uses the Windows' (Internet Explorer) settings, resetting them is also recommendable. You'll find it in the Control Panel-> Internet Options. On the last tab on the right there's a Reset button in the bottom right corner.