I have a folder called DEFS inside the AVAST folder which has a weight of 63 GB I can not delete files from this folder and I need to free up space, what should I do?
This is highly unusual on occasion my xp system will show the last coule of defs upsates and some of the streams. Generally if that happens there are 2 defs sub-folders that have the full database (house keeping should hive off old sub-folders) my defs folder is about 380MB not GB.
I would also suggest an Avast Repair.
Do you have the virus definitions update set to Automatic ?
I take it you leave your computer on all of the time ?
If so I would suggest a full windows restart as I believe this is the time when avast clears up these old folders (it appears to do this on my XP system).