1)
I always clear my cache
... I did notice something pop up at the time I was on the Internet
2)
Also what really bugs me, if Avast found these trojans in the first place why didn't it put them in my virus chest for deletion? ... so being me just clicked the red x
@1)
how can your cache be empty while you're surfing ?

and if you cleaned your cache (manually or automatically) before running avast Scan (was it thorough and with archiveScan enabled, btw..?)
-> Then of course avast won't find anything anymore OnDemand
@2) because being you

, you just clicked avast's warning away, and then it (=the On-AccessScanner) just denied access and left the file in place
- Do you have avast home or pro ?
- what about the XP-EventLogs ?
[EDIT]
P.S.: The avast name on it is what you gave in your topic-title or under the ALWIL section in the VGREP listings
And as to "cure" ..
a) there is no real cure necessary if you use a secure browser, i.e. NOT IE -> delete the file detected by avast, or clear out your cache
b) IF the Exploit could exploit your browser/system, then check for additional/followUp-infections with e.g. avast, ESCAN & Hijackthis (or Spydoctor)
