Linux Is the only antivirus/antispyware/and everything... a complete OS.
Once u install it. U are free from virus and spyware for life long.....
And if u are in Windows and think of finding good antispyware, then u have only one option.... remove windows. Coz Windows itself is a spyware... Whatever u do in ur windows is always reported to Micro$oft by the daemons(background Processes) running in XP....
For Example, Dr.watson is the spyware daemon of Micro$oft which is always active as soon as windows starts running.....
And Windows always hint u : When u shut down the computer,......it says:
"You are now safe to turn off the computer" When its open u are never safe.......
Links of linux:
1. www.nepalinux.org
2. www.ubuntu.com
3. www.debian.org
4. www.fedoraproject.org
5. opensuse.org
and lots......
Regards,
Prabin