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After upgrading to the latest Firefox (3.6.6) today, the browser will no longer open any websites, I just get a blank page

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After upgrading to the latest version of FF, I can no longer access any webpages. The IE browser does work though.

This happened

Every time Firefox opened

i upgraded FF software

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; eMusic DLM/3; .NET CLR 1.1.4322; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; Creative AutoUpdate v1.40.01)

After upgrading to the latest version of FF, I can no longer access any webpages. The IE browser does work though. == This happened == Every time Firefox opened == i upgraded FF software == == 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; eMusic DLM/3; .NET CLR 1.1.4322; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; Creative AutoUpdate v1.40.01)

Alle svar (1)

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I had to go back to the last install file I had on hand, which was 3.0.9 because FF "denied proxy" after upgrading. Once I get that message, the program won't even open until I install an older version. Upgrading again yields the same results.