Windows 7 brand new computer has a virus system restore does not work

Dell Inspiron m3800
Windows 7
Just got this computer and loaded Microsoft Office. I have Macafee but it comes from an installer later. Explore was running really slow so I tried Firefox and must have loaded all that performance enhancing fake virus stuff and won't go away. No restore point works. Suggestions please?
artismobileAsked:
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aadihCommented:
The best course is to perform a clean install.  You have not much to lose. And you'll have a clean computer. Forget about McAfee, a resource hog. Get a free antivirus software (Avast, AVG, Avira... recommend: Avira).
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artismobileAuthor Commented:
I agree I have AVg on my other computers.
How do I do a new install?
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artismobileAuthor Commented:
It won't let me finish installing Essentials
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artismobileAuthor Commented:
I do have a windows 8.1 recovery flash drive
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artismobileAuthor Commented:
I'm trying a Dell Back up and Recovery now while I am waiting for responses. Guess it can't hurt at this point because I don't have anything on this new computer
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Windows 7

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