Firefox installation does not initiate. Have tried different versions but the pop-up only remains for less than 1 second then closes down.

Firefox crashed without even opening the main window - just the apology pop-up appeared. Nothing I could do would open the programme. MS Fixit identified a problem with IE8 and put it down to AVG8 Link Scanner. I disabled this, and tried Firefox again. It worked perfectly for a time. Later, when trying to open Firefox, nothing happened - no crash pop-up, no navegation window - zilch. I tried to re-install the programme, but as soon as I execute it, the "Extracting" pop-up opens then closes immediately. I tried to uninstall Firefox using the Windows control panel, but this did not work - Error 21, whatever that is, then tried to reinstall again with the same result.The Firefox uninstall did work. I unistalled my AVG8 anti-vir and tried again - nothing. I downloaded an older version of Firefox - same result. Something is blocking any activity concerning Firefox and I am totally at a loss to identify it. Can anyone help, please?
== This happened ==
Every time Firefox opened
== this afternoon - May 7th. 2010 ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

1. Is there a "hung" firefox.exe process in the Windows Task Manager?
2. Have you tried restarting that PC?

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