When Firefox starts, window opens, "Is your PC slow" by Systweak. powered by Afterdownload cannot delete

Question

Yesterday, when I turned on Firefox, an Ad for a Registry cleaner pop up on the opening page. I tried to delete the pop up but there is no "close" button. I tried to delete using Add or Remove Programs Control panel), did not show up in the Display list. Restarted, no change. Tried : System Restore, no effect still would not delete. If I opened a "New Window" it would be free of the Ad pop up. In desperation I tried to download the Registry cleaner, got an error message from my virus scanner that the .exe file was a possible virus. Ran my virus scanner (ESET) & DELETED THE .EXE FILE. Opened FireFox, the popup window was still there.

Answer 1

Try the Following:
'''Scan for Malware'''
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try some of the following programs to scan for malware:
* [http://www.malwarebytes.org/mbam.php MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://windows.microsoft.com/MSE Microsoft Security Essentials] (A good permanent anti-virus if you don't already have one)
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
'''Reset Firefox'''
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
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