other than what you mentioned above, there are more ways to make your account safe

1. hide your CD keys off other people, including your fwens and families. your so called 'fwen' and even your brothers/ sisters can turn into monsters when comes to profit.

2. 'move' your bnet account to another mailing service after you have recovered your stuff. some might argue this is not necessarily but do understand the hidden threat: your mailing account hooked to your current bnet account might also be compromised, and some of them would have certain backup-plans for you to recover your password, in which haxxor can take advantage of.

3. protect your pc, by any means necessary. other than installing AV and do regular scans and hope it will protect it, try to restrict/ block others from accessing your pc, or installing stuff into it. if there's malware/ virus/ trojan detect in it, disable any form of network and internet access and limit resources to be inward only and stop any type of login related action using that pc other than window login.