Thanks for your time.
I just installed Antivir and felt naked without a web shield, so I reinstalled everything in Avast! except the standard shield.
In theory, this should work, however the apps froze on startup, so I set Avast! to launch after all other applications load and they seem to like each other now.
What I'm here to ask is whether this should theoretically cause any problems.
Please don't reply with, "OMG YOU ONLY NEED ONE ANTIVIRUS" because I am only running one antivirus. My reasoning for running both apps is so that the Avast! web shield will take effect during browsing, and Avira will handle everything locally. The issue I have with using Avast! for everything is that it seems to constantly scan all my files, without letting me set it to just "scan on application read/write" which causes major slowdowns.