First of all please let me know what does it mean in your first sentence:

"So you dropped the DB. Well in this case, the ADNM is not running, right? How come the transaction log is then growing? "

If you intend drop equal to delete it then:

a) SQLAgent$AVAST stopped
b) avast! Management Server stopped

Delete the database (really, rename both ldf and mdf)

Trying to restore from backup

a) SQLAgent$AVAST started

Restoring using AMS Maintenance

Choose the last .bak file done
Errors like this mornig

Opening the error.log file

26/07/2004 16.20.35 1090851635
SBS\administrator 6112 Database check on SBS2003\avast server failed with 0000A410 error. Use AMS Tool to fix the problem.

I attach the file

No change were made about sa

If restore was made with b) avast! Management Server running I got error 42000 AMS While restoring the database.

The ldf and mdf have been created into the data folder, but the size of the files is the same

Thanks

Sergio