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I want to delete a program called 'Security Tool', which loaded itself on my system after prompting me to upgrade FireFox. It refuses to be deleted, however. Guidance?

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A program called 'Security Tool' loaded itself on my system after prompting me to upgrade FireFox. It's apparently a fake security program which prompts me for my credit card info, whilst refusing to allow me to use Windows Mail and other programs. I wish to delete it, but it refuses to allow me to do so. When I try, it locks up my system. In the meantime, it will not allow run in safe mode to do a system restore. Guidance?

== I attempted to upgrade FireFox

A program called 'Security Tool' loaded itself on my system after prompting me to upgrade FireFox. It's apparently a fake security program which prompts me for my credit card info, whilst refusing to allow me to use Windows Mail and other programs. I wish to delete it, but it refuses to allow me to do so. When I try, it locks up my system. In the meantime, it will not allow run in safe mode to do a system restore. Guidance? == I attempted to upgrade FireFox

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I have no idea how to get this off my computer... somebody please help.

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I contracted Security Tool the same way about ten minutes ago on my Win7 Home Premium laptop. Firefox prompted me to do an immediate update the way it normally does, with a convincing update screen that looks like the typical Mozilla update prompt. However, the installer I downloaded was in fact "Security Tool." The program firewalls Firefox to prevent searches and also prevents access to Task Manager via Ctrl-Alt-Del. On the surface this appears to be a particularly nasty strain of malware / scamware, and FF users need to be warned and/or innoculated immediately.