Avoiding Viruses
Apart from anti-virus software, you can cut down the amount of viruses you get by avoiding certain websites.
Avoid the following sites: pornographic sites, Illegal music/movie downloading sites and other websites that may contain harmful scripts. They are often infected with malware and viruses. By downloading videos and songs, you are unconsciously inviting viruses on to your computer. Scan all USBs, floppy and CD disks before using them. These popular items easily carry viruses.
By staying away from any kind of dodgy sites like these, and also investing in the best spyware remover software and antivirus software you can get hold of, will definitely help.