This is not much to go on. Provide some more information like:
1) What version of Avast
2) What windows version
3) Is the file servers.def still on your system?
4) In what did you grated access?
5) What did you changed just before this happend? (programs/settings)
1)I am currently using 4.1.418 for Home not Pro
2)windows Xp Home Edition SP1....
3)There ISN'T any server.def file... Maybe this is the problem... I searched the HD and found a server.def.lkg only
4) Before asking I checked the FAQ and somewhere said to grant access to somefiles
5) I didn't install anything... It just stopped working for some unknown reason