Major Virus attack

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Hi, Once again, I have been severely attacked by a nasty virus named: Antimalware doctor. This is a nasty scam and the scammers wanted me to buy a full version of their application. It was giving fake alerts of security and I had so many attacks of Trojans, Hijackers, Virus bursts, etc. It took me so long to erased everything. I used Malwarebyte's Anti-malware and it didn't work at the beginning. Then, I tried to use Stopzilla but that is a scam because they suddenly charge money after finding the viruses throughout the system. So, I remembered, somebody referred me to Spybot Search and Destroy. I think it worked, but it took hours for cleaning, searching and checking my system. Then something occurred: over 40 black screen windows appeared non stop for like 1-2 minutes with Win32 from DOS, I think. I was panicking because I thought that I was loosing my computer. I am wondering what are the best programs ( and the free ones) to destroy easily those nasty virus attacks, including the trojans, hijackers, etc. I am wondering that what kind of a human being does it takes to creates disgusting viruses. They should be ashamed of existing and should be punished. I got something really nasty since last night and I didn't not slept at all. About 4 months ago, I caught another viral attack. I am wondering what is the point of buying computers when there dumb criminals out there. On last thing, is it better buying a MAC or a Windows from Microsoft, if somebody has an idea, I would appreciate the advice. Thank you.