Why is 8.01 update downloading an older version of firefox onto my computer? (Other problems also)

Question

For trusted sights, I let downloads automatically be made when available. I left the computer on overnight and found "Win 7 Anti Spyware" on my computer this morning. I ran "roadkill" and "malwarebytes", then deleted the infected objects (6 of them). I then got a message that my firefox was outdated and when I went in to dowload newest version, it downloaded Firefox 4 instead. I wanted to search for other people with the same problem. When I did google searches on firefox and clicked on a link, they were immediately redirected to a new sight. IE google searches worked perfectly fine, '''unless '''they were directed to a firefox page, which I thought was odd.
Ran rkill and malwarebytes again just to be sure, but they didn't find anything additional.
So now, I've removed firefox completely, run rkill again and am in the middle of running malwarebytes all over again. 44 minutes in and it hasn't found anything yet and neither did rkill. It should be done soon, but I'm afraid the problem won't be taken care of and I'm reluctant to download firefox, or even go to the site, on that computer once everything is finished.
Any help or suggestions for tracking down my bug would be appreciated.

Answer 1

You may be infected with malware.
Do a malware check with some malware scanning programs.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of their databases before doing a scan.<br />
<br />
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also:
* "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
* https://support.mozilla.com/kb/Searches+are+redirected+to+another+site
If using the above listed scanners does not fix it or if you are blocked from installing those scanners then ask advice on one of the forums that specialize in malware removal mentioned in the <i>Popups_not_blocked</i> article.
* "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked