After installing Firefox then closing it, I cannot open it, PC says it has been cancelled due to restrictions on my computer

Question

I have run Firefox for over a year now. However I ended up with various pop-ups recently though they were easy enough to remove and didn't effect Firefox in any obvious way. In the past few days every time I have attempted to open Firefox, even right-clicking on the .exe file a warning pops-up saying "the operation has been cancelled due to restrictions in effect on this computer. please contact your system administrator".
I uninstalled and reinstalled Firefox and it worked fine, only to return to that warning message after I closed and re-opened it. This has also effected Google Chrome in the exact same way even though I never owned Chrome until all this business began. Internet Explorer, which I'm on now has suffered no problems.

Answer 1

Do a malware check with some malware scanning programs on the Windows computer.<br>
Please scan with all programs because each program detects different malware.<br>
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware:<br>http://www.malwarebytes.org/mbam.php
*AdwCleaner:<br>http://www.bleepingcomputer.com/download/adwcleaner/<br>http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware:<br>http://www.superantispyware.com/
*Microsoft Safety Scanner:<br>http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page:<br>http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy:<br>http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan:<br>http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller:<br>http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked