Have recent Windows Updates blocked Mozilla Firefox?

Updates for Windows 7 for x64-based Systems (28/04/11)
(KB2515325)
(KB2522422)
(KB2492386)
(KB2488113)
(KB982018)

Mozilla Firefox (or Google Chrome) will not open after this update - all you see is a continuous blank white screen with 'connecting' at top and 'Looking up www.google.ie' at the bottom from Firefox

Can only get internet access through Internet Explorer (64-bit).
When you set a system restore back before these updates were added Firefox works perfectly

Internet Explorer (64-bit) is now the only web browser that works and it cannot be the default web browser i.e. you can't open a link from an e-mail etc.

try google chrome, it works and has always worked for me. i did not install the update for IE 9 (i do not know the KB number but i assumed its in your list)