Agree with Tech and JTaylor
you can use as many on demand scanners as you want to
Installing one of the ones with some resident function could help
even
Spybot SD helper and T-Timer
Spyware blaster works by setting the "kill bit" on malicious ACTIVE-X- works only with Internet Explorer
(it does protect against some tracking cookies with Firefox)
but
Since IE can be opened by malware (unless you have it really locked down) Spyware Blaster (or similar) is a must
A HOST file will help prevent baddies from "phoning home"
MVPS hosts, Hphosts, Spybot all can provide HOST files
Just run ONLY one AV and ONE antispyware "resident"
and quarantine, send to chest, vault - whatever any hits for further analysis and restoration if a FP
delete and - well- see ya
Scotty, the beloved by many Win Patrol watchdog, can also monitor critical files and reverse most unauthorized changes Scotty gets along with everyone
I still have I-E Spyads installed in Internet Explorer "Restricted Zone" eventhough no update for a long time - since I do not use IE -dos'nt hurt - might help
I do not use IE except for updates -