Avast Antivirus Professional 4.8

Avast Antivirus Professional 4.8 

Download Avast antivirus 4.8 free for windows xp and vista. Avast 4.8 antivirus is a very popular anti-virus software. (Avast 5 is now available.) Avast antivirus 4.8 includes anti-spyware and anti-rootkit protection, scanning, detection and removal capabilities and you can continue to download this old version here.
Avast 4.8 antivirus features:
Built in anti-virus features,
Built in anti-spyware features,
Built in anti-rootkit based upon the leading GMER technology and
strong Self-protection to prevent malware from turning avast protection off
Other features of Avast antivirus 4.8 includes auto updates, P2P and IM shield, Network shield, Web shield, email and RSS scanner including Microsoft Outlook and Exchange support.
Avast antivirus 4.8 supports 32-bit and 64-bit versions of Windows XP and vista:Avast antivirus 4.8 supports both 32-bit and 64-bit versions of Windows XP, Windows Vista, Windows 95, Windows 98, Windows Me, Windows NT 4 (No Server), Windows 2000 (No Server).