Do you have a flash drive? Obviously you have access to another computer so this would be an alternaive. You could download Firefox to a flash drive, hook the drive up to your pc, and install from there. OR you could download Firefox and burn the file to a cd and install from the cd.
You could also try uninstalling IE and reinstalling. After you get another browser installed, you can use that for IE download.
If you are using IE7: Internet Explorer 7 Download
Another thought, if you had IE6 previously, and uninstall IE7, it should revert back to IE6.
Also, if you manage to install Firefox, you might want to post in the Am I Infected? forum and make sure your system is clean before reinstalling IE.
Edited by Queen-Evie, 24 March 2009 - 12:31 PM.