Go to download.com and search for AVG Free. Download it and install it.
No cost. Excellent anti-virus protection.
You have to purchase the subscription to Avast. The free version doesn’t help.
We use AVG Free too and it does the job. When you go to download make sure you check the free download because they will always offer the ‘Free’ UPGRADE which will expire and require you to pay for it later.
Download SpywareBlaster, a resident malware blocker, install it,and keep it updated.
Download and burn a CD with AVG Rescue Disk or make a bootable USB flash drive with it to overcome otherwise very difficult malware and trojans, so as to permit installing/running MalwareBytes Free in Safe Mode (with networking). If possible, use a wired connection.
If all else fails, remove your hard drive and install it as the second hard drive on another known good computer with the above programs, and clean it up there.
This last step is the first one we would take on in the shop, thus wasting little time to knock out the killer viruses.
AVG is found at this site: www.grisoft.com
Free basic protection has constant updates on all emulations, from the same convention that all anti-virus outfits use.