Hi, you should be able to remove it using your PCs Control Panel - [http://www.shouldiremoveit.com/Ace2Three-38245-program.aspx see here.] You could also check your pop-up blocker settings - [[Pop-up blocker settings, exceptions and troubleshooting]]. Also try an ad-blocker add-on like [https://adblockplus.org/en/firefox Adblock Plus.] If you still have a problem with it, you can try these free programs to scan for malware, which work with your existing antivirus software: * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller] * [http://general-changelog-team.fr/en/downloads/viewdownload/20-outils-de-xplode/2-adwcleaner AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page]) * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] [http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Windows 8 has antivirus [http://www.microsoft.com/security/pc-security/windows8.aspx#antivirus built-in] already. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!

See the attachment i have attached.See the black box in the middle of the window,thats what my problem whenever I open a website,that adds comes up .Please help me to remove it.

Please see [[Remove a toolbar that has taken over your Firefox search or home page]]. Let us know if this solves the problem.