I have the free version, so in the suppor page it suggest to check the faq, visit the forums or pay for the premium service..
Anyway, I have been "touching" all the parameters and finally I've seen that the problem may come from a checkbox under "Components - File system shield - Analyze on writing" which says something like... "Analyze files while writing".. If I uncheck that option, everything goes ok. I guess that when writing that file, Avast leaves the file opened and the rest of programs can't access it.
Is there any important problem leaving that option unchecked?
Now, I would like if there is any way to restore de default configuration because I've touched some parameters and although I think that I've left everything as it was before, I would like to ensure that I have not missed anything.
Thanks!