Computer infected heavily after downloading security programs, add-ons

Hello, as i said earlier, I am quite new at this. I made the following additions to my XP system tonight:

Firefox Browser
Avast Home
Comodo FW
Malwarebyte
SuperAntiSpyware
Spyware Blaster
NoScript
ABP
Firekeeper
Dr. Web add-on
Finjin add-on
WOT

All of a sudden, Avast has found 5 Trojan Horses, MBAM found 7 infections in the first 10 seconds, and my system is running slow.

Might I have done something wrong?

Can you post the names and locations of the files as recorded in the logs?

Thanks. Think I’ve got it handled (actually, Avast has it handled).

I panicked a little. Just had to rebuild my system this week.

Working great with the add-ons.