Thanks Neal. As suggested, here is the results from running GooredFix:

GooredFix v1.92 by jpshortstuff
Log created at 16:54 on 10/06/2009 running Option #1 (Compaq_Owner)
Firefox version [Unable to determine]

=====Suspect Goored Entries=====

C:\Program Files\Mozilla Firefox\extensions\{A4303829-31E0-45FA-BA55-8B19F03E55DA}

=====Dumping Registry Values=====

[HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\extens ions]
"{20a82645-c095-46ed-80e3-08825760534b}"="C:\WINDOWS\Microsoft.NET\Framework \v3.5\Windows Presentation Foundation\DotNetAssistantExtension\"

[HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\extens ions]
"jqs@sun.com"="C:\Program Files\Java\jre6\lib\deploy\jqs\ff"