Free download antivirus for windows 7 ultimate

[ajithbalank]

 

[unksol]

Google Microsoft security essentials

 

[hairystuff]

Avast is another free virus software:
http://www.avast.com/free-antivirus-download

 

[outlw6669]

Microsoft Security Essentials is free, fast and fairly good.
http://windows.microsoft.com/en-US/windows/products/security-essentials

 

[Dark Lord of Tech]

http://www.zonealarm.com/security/en-us/zonealarm-free-antivirus-firewall.htm

 

[arson94]

My vote also goes to Microsoft Security Essentials. I haven't had any malware or viri since I've started using it when it first released, but I also don't put myself at risk that much either.

 

[J_E_D_70]

MSE rocks. I've also used AVG Free in the past and it worked well.

 

[Onus]

I've read only good comments about MSE myself. Who is your Internet Service Provider (ISP) ? Many ISPs provide one of the better commercial ones (e.g. Norton, vastly improved from just a couple years ago, when it was an atrocious resource hog). I've also used AVG.
I would also recommend Firefox with the Adblock+ and NoScript add-ins. Not letting malicious scripts run also prevents poohware from getting on your system.
Like Arson94 points out though, staying safe is as much about your habits as about whatever protection you get.