I already posted about my experience with this under FREE Facebook Layout. It automatically changed my homepage to BING, and installed a BING toolbar that I did not need. I finally figured out what had happened and how to fix that, BUT there still might be some spyware or keylogger on my computer.
Fix Homepage----Right click on the BIG E---left click on properties--- General Tab should show current homepage, and it will be highlighted. Hit your delete button, then type in www. google.com OR whatever homepage you want. Click Apply and you should be All set.
Do you have the BING toolbar?? Do you want to keep it??