Eset Nod32 is a paid antivirus that includes the usual anti-malware features, and also anti-spyware. Nod32 also seems to have less degrading effect on system performance compared to other premium antivirus software.
Even the cheapest version costs over $20 (converted from my local price, may vary with your locality). However, here is a method to get a valid, legitimate Eset Nod 32 license key for free:
promotional page(link removed as promotion is no longer available) for Eset AV. The form is not in English, so fill each field as per details below (ie. first field is username and so on):
Male (option 1) or female (option 2)
Date of Birth
City of residence
The serial number for Eset AV will be sent to the email address you provided above, so provide a valid one.
Now, register the serial number at Eset website to receive your username and password.
Note that this license is valid only for 90 days; once that limit is up, check here again – we will update with any new free license offers.