IE popups, navigation sound

Hi.

I got three or so IE popups in the last couple days and/or navigation sounds.
I don't use IE except for Microsoft Update or if something doesn't work in Firefox.
I use "Noise" add-on for Firefox (makes same navigation sound in Firefox that you get in IE).

AVG Resident shield has been popping up during Firefox sessions with tracking cookie notifications.
It used to just pop up once at start of Firefox session or mebbe when I got online.

Browsing might be slower.
It's hard to tell--I use dialup.

I've heard "Congratulations, You've won" or something a couple times.
(just audio-no popup)

Ad-Aware and AVG just find cookies, prolly more than normal.
AVG found a trojan, maybe a couple months ago

Selected system config:

Windows xp sp3
SpywareBlaster 4.3, database = 7/25/2010
AVG free 9.0.851, last update = 7/28/10
Ad-Aware free 8.1.0, last update details = 0149.0342

Can you fix it?
Thanks

AVG just found:

C:\Documents and Settings\mark\Application Data\Sun\Java\Deployment\cache\6.0\41\5b748329-6c93642d
Trojan horse Cryptic.ARX
Moved to Virus Vault"

C:\Documents and Settings\mark\Local Settings\Temp\7032828.exe
Trojan horse Cryptic.ARX
Moved to Virus Vault

C:\Documents and Settings\mark\Local Settings\Temp\loader.exe
Trojan horse Cryptic.ARX
Moved to Virus Vault

C:\Documents and Settings\mark\Local Settings\Temp\smss.exe
Trojan horse Cryptic.ARX
Moved to Virus Vault

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Ya'll can close this topic.
It's fixed.