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Virus blocking AVG and Windows Defender

I have a HP Pavillion Entertainment laptop running Vista Home which has a virus calling itself Security Tool. It tells me I have 300 Trojans and I need to install the software and to do that I need to purchase it and theres a box for credit card details ( like I am that stupid). I can't scan my computer because when I click on AVG it is blocking the window from coming up, I see it flash but it dosnt load. I can get into the control panel and other areas but can't access AVG or Windows Defender to scan my computer. Can anyone tell me how I can get rid of this. Thank you in advance for any advice good or bad that anyone has to offer me. Junglegirl.

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Re: Virus blocking AVG and Windows Defender
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Thank you so much for your help. I have been successful in removing "Security Tool" (I hate even typing it in case it sees me).
Just one thing I am stuck on, I don't know where to find my Hosts file, I have downloaded Hostsperm.bat onto my desktop but I am kind of stuck, am scared I am going to do the wrong thing regarding my Hosts file. Are you able to help me out with that, guess I am having a blonde moment or just plain tired and can't think straight I have been at it for a few hours now had trouble getting past the virus in the beginning, that's why I didn't attempt this until the weekend because I knew it was going to take awhile. Thank you. Junglegirl Grin

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