1 firewall active. If Comodo set up correctly then suggest "disabling" Window one. Major conflict/slow down potential here.

You should be fine w/ Avast plus free on-demand Malwarebytes MBAM. exe.

I would expect conflict & slow down problems when Ad-Aware is combined w/ Avast! so recommend you un-install Ad-Aware program since your happy w/ Avast!

After that, if you have, I'd run CCleaner or other cleaner, & then reboot. This should make major improvement noticeable.

You can get CCleaner SLIM (check "Other builds") for FREE from:
http://www.ccleaner.com/download/builds

Good Luck!! Happy