Affiliate Marketing Secrets

I started noticing that my browser is acting weird. My computer turned off repently so I started to get really worried since is the one I use for work.
I tryied to download an anti-virus or malware removal and doing some research on my browser I noticed that before directing to the url I was trying to open, my browser redirected to gamblingpuma.com and then ended up in the right url… But when I tryied to go to a link from google it would redirect me to gamblingpuma.com and then to a weird suspicious site… I’m really worried since my computer has turned off twice tonight without any sign… Do you guys know a solution on how to get rid of this virus and protect my information??? Please help!!!
I am trying to look for solutions (through my ipod becase my PC wouldn’t even open a reliable site anymore) and this is all I have found.. Although I don’t know how trustable this info is:
http://windowsprotection.net/remove-creditpuma-com-hijacker-and-affiliated-scams/
P.S. What’s the best Free Anti Virus you recommend?