At home I have a Tecra 8000 running Windows 2000 Service Pack 2. On the g2g homepage it seems to say that SP4 is the only Windows 2000 version that's affected by this Downadup/conficker/whatever thingy that's going around.
Also I have like no antiviral anything installed on the machine, which is obviously dumb. Someone on this site a billion years ago pointed me to some free stuff so I wouldn't have to shell out for Symantec this or McAfee that.
Any recommendations?