Do a malware check with a few malware scan programs. You need to use all programs because each detects different malware. Make sure that you update each program to get the latest version of the database.

http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware http://www.superantispyware.com/ - SuperAntispyware http://www.safer-networking.org/en/index.html - Spybot Search & Destroy http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page .......... See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and What to do when searches take you to the wrong search website

tried spyware programs suggested, i still get the advertisements. it is only with Firefox. usually when i first start up firefox,

think i figured out the problem. noticed some add ons for firefox i didn't know about when i had some updates. i disabled a price gong add on and some Bing search toolbar add on. this fixed the problem, not sure which one was doing it but it has stopped.