I believe Firefox is infected by a trojan virus, I run a complete virus scan but it does not pick up anything

I believe the virus is associated with firefox, I run a complete scan using McAfee, anti virus, but it shows up nothing. Firefox constantly shows no responding signs, then it will be normal again. Or I have to go into task manager and end firefox.
There is a fake transaction from my bank account, is there anyway I an remove the trojan?

Hi leehuiling
try with a few malware/virus scan programs. You need to use all programs because each detects different malware. Make sure to update each program to get the latest version before doing a scan.
http://housecall.trendmicro.com/ - Trendmicro online
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/antivirus-partners/windows-7.aspx
check also for a rootkit infection with TDSSKiller.
http://support.kaspersky.com/viruses/solutions?qid=208280684
thank you

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