Thanks,
The avast folder is empty and the file, with the same creation date is: Perflib_Perfdata_710.dat and when I try to open it, it says it's in use by another program.
Edit:
The file is not in the avast folder.
The creation date seems to occur every time the computer is is turned on.
I've used other free AVs and I know they sometimes utilize the windows\temp so I think this is what is happening. Avast seems to be the least intrusive though.
I'm just curious to know if this is normal for Avast.
Thanks again.