Don`t worry about the OTM log, if it ran OK that will be fine. It was nothing malicious that was being removed. Regarding a Software Firewall, yes you definitely need one for XP, Windows own is not good enough.
If you prefer Comodo, then re-install it, make sure to leave the AV component turned OFF or it will clash with AVast. If you`re asking for my recommendation for a Firewall then it has to be Online Armour.
My recommendation for a Firewall, Online Armour Free Firewall
is one of the best available, also go Here
for an excellent tutorial that will show you how to use it.