Miktex 2.9 on Win XP, installed in a user account (single user mode).
Since a few days I have problems with the package manager: When I right click on an entry a "MiKTeX problem report" pops up beside the context menu and the package manager freezes and I do have to use the task manager to kill it.
It doesn't happen always, it seems to depend on the speed/accuracy of the right click.
The content of the problem report changes. I saw "Windows API error 1446 Dropdownmenu bereits aktiv" and "Windows API error 1814 der angegebene Ressourcenname wurde nicht in der Imagedatei gefunden".
I haven't changed the hardware or drivers, but some days ago there was a windows update where 5 updates have been installed.
I made some test also on a win7 but could reproduce the problem there.