The virus must have affected your CAPS LOCK key!!! Quick!! Smash the keyboard with a hammer to prevent the spread of this horrible virus
First, I would suggest you continue to use Firefox and forget about IE except for doing windows and office updates.
Second, I would say that's malware or a browser hijack, though you may have viri (viruses) in addition.
I would begin my downloading, updating, and running Spybot search & destroy, Lavasoft's AdAware, and Microsofts AntiSpyware programs. They are all free.
Do you have an anti-virus program installed? If so update it and run a complete scan. If not AVG antivirus is free and a decent performing product.
Try the above and we can go from there
Just my .02 (YMMV)