Useful free software

Avast Antivirus virus prevention for non commercial use

AVG Antivirus virus prevention for non commercial use

Hijack This free tool from Trend Micro for process removal

Malwarebytes malware and spyware removal tool

Process Explorer from Sysinternals of Microsoft for checking what processes are running

Spybot - Adware removal / Spyware removal software

Zonealarm Firewall for non commercial use

Open Office for word processing, Spreadsheets, Presentations, Graphics, and Databases

Adobe Reader for reading PDF Documents