See this - http://malwaretips.com/blogs/pc-optimizer-pro-virus/

Sometimes a problem that may seem to be with Firefox could be caused by malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

Hitman pro claimed it would do a one-time 30 day activation, if it found anything (and of course it did, after the microsoft software found nothing) then it wanted an activation key#, of course I didn't have one, I got an e-mail to respond to but thought better. So I am now leery of hitman pro, the microsoft scan said nothing was infected, but I got another adware strike while it ran. My pc seems ok, but this laptop with windows 7 is not ok, I'm going to try malwarebytes now. Still working on issues, not solved on laptop

Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

Troubleshoot Firefox Issues Caused By Malware {web link}

You may find detailed guide how to delete adware and other viruses on your PC manually link removed You may open any article and read manual below.

thanks, I thought I had closed this question, I guess not

locking due to age of this thread