Originally Posted by chaley

I think I know what is going on. After a boot, some event triggers Windows to do a one-time check of its "security catalog", which is a list of every update ever applied. In calibre's case the trigger seems to be loading the font manager (atmfd.dll).


Assuming you are up-to-date with windows updates, one possible fix is Windows Disk Cleanup (in Accessories). Sometime in the last year or so Microsoft added "Windows update cleanup" to the list of possible tasks. Doing this cleanup (supposedly) removes all cat files that have been superseded by something else or are for some other reason no longer useful.

Registry mess can also affect the catalog scan. If you haven't done it you might consider running something like CCCleaner's registry cleaner. Be sure to make a backup of the registry, perhaps a restore point, and for paranoia a full system image backup.