Back in December 2014, after pushing out some Microsoft updates, almost everyone in our agency with an HP printer installed had to re-install their print driver. It seemed to only affect clients on Windows 7 64-bit with Office 2010 32-bit installed and using the HP Universal Print Driver. I just assumed it was a bad patch from Microsoft and didn't look into it further.
Then the same thing happened again two weeks ago after pushing out February 2015 Microsoft updates to clients. This time I was able to narrow the problem down to a specific patch: "Update for Microsoft OneNote 2010 (KB2956075) 32-Bit Edition"
After installing the patch, there are 7 files that end up being deleted from C:\Windows\System32\spool\drivers\x64\3\ - The files are:
However, it is not the patch that is deleting the files. Running Sysinternals ProcMon shows that it is actually SoftMon.exe from LANDesk deleting the files. This happens a few minutes after the patch has completed its install. At this point I am not sure why those files are being deleted, but when it does happen, it breaks printers using the HP Universal Print Driver.
This problem does not happen if I remove the SoftMon component from the LANDesk agent by running softmon.exe /remove.