hmm as far as i can see, my PC is still running as it is. so yeah, i hope nothing screws up.
should i expect that something "might" happen in my PC? or something gets worse if i don't get any remedy to fix this one?
Well, let's look at the situation. Avira quarantied what may or may not be a virus.
If it is a virus, your system is working fine now, no crashes. The virus is safe in quarantine. If those 2 files are not a virus, your PC is still working fine, so why bother restoring them.
If those 2 files ARE viruses and you try to restore them, who knows what will happen.
So your best course of action is to do nothing, any system issues will show themselves soon enough if there are any. Play some games, open some programs, movies etc... see if anything does not work right.