text: Use one of the free anti virus instead, then download the free Bitdefender to act as a second on demand scanner.\nhttp://www.comodogroup.com/  - Comodo security suite.\nhttp://www.grisoft.com/doc/1 AVG anti virus or\nhttp://www.avast.com - Avast Antivirus \n\nhttp://www.ewido.net - AVG(Ewido) anti trojan.\nhttp://www.lavasoft.com - Ad-Aware SE Personal anti adware\nhttp://www.safer-networking.org - Spybot Search and Destroy anti spyware\n\nProblem is, if anyone else gives you their key, Bitdefender notices that there are two pc's using that key - so both of them are blocked from updating.