Can we try the following
Access the following link and save the latest Firefox installer
to desktop
http://www.mozilla.com/Don't install it yet
Which reminds me, I have to update my version also

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Access the following link and save the latest Java installer to your desktop
Sun JavaClick on Download under
Java Runtime Environment (JRE) 5.0 Update 8Accept the License Agreement
Select "Windows Offline Installation, Multi-language".
Don't install it yet
Access your add/remove programs and remove
Viewpoint Media Player
Mozilla Firefox (1.0.7)
J2SE Runtime Environment 5.0 Update 4
J2SE Runtime Environment 5.0 Update 6
Java 2 Runtime Environment, SE v1.4.2_06Reboot the computer
Install the latest version of Firefox from the installer on the desktop
Then install the latest Java
Once installed you can delete the installers
Try posting with the newest version of Firefox
EDIT>>I fixed the link to Sun Java