This applies to Windows 7 SP1 x64 Professional with SP V220.127.116.11 and Norton Internet Security 2011. IE9 RC is also on this system.
In recent weeks, I have experienced numerous crashes on SP V18.104.22.168 when attempting to add new accounts. In addition, when using Manage Accounts to edit or relocate accounts, SP crashes when attempting to SAVE the changes. At the same time, I was experiencing a problem when installing downloaded version updates of some programs. On running the update installer of the program, the installer would encounter a MoveFile error code 32 (another program is using this file) and request a Retry. Retrying would clear the error. This error may occur numerous times on different files during the installation process. Program installers that I experienced this on are DisplayFusion and Weather Watcher Live. IF I disabled NIS 2011 Antivirus scan before starting the installation process, then no MoveFile error code 32s occurred and the program installer worked as designed.
I ripped out Norton Internet Security 2011 and installed Avira Premium Security Suite V10.0.0.592. Since the conversion, no more SP crashes when adding accounts or managing/saving accounts. No more installer issues on DisplayFusion or WWL program updates.
It does appear, however, that SP has a bug in it. It does not seem to be able to handle the condition that another program has set the database busy....for whatever reason, right or wrong. Instead of SP requesting a retry, SP crashes. NIS 2011 and I suspect NAV 2011 also has some type of issue/bug that is generating the condition...but that is something that the Symantec gurus need to work out.