A third computer problem is lack of malware protection. Malware basically means bad software, and includes adware, spyware, and more. An anti-virus program is usually not enough to protect against malware; you need a firewall and/or malware protection. Fortunately, there are numerous programs that are both effective and reasonably-price (or free). I use these three on my computers, because I haven’t yet found a single program that offers 100% comprehensive coverage. Run the scans at least once a week and your computer will be in great shape.

ZoneAlarm Firewall | Ad Aware | Spybot