If you are running Windows XP SP2 (including Media Center and Tablet Edition), and you have applied the Microsoft updates 925902 (MS07-017) and security update 928843 (MS07-008), and you are using Realtek audio components on your system, you may receive this error message when trying to use ElsterFormular, Realtek HD Audio Control Panel, TUGZip, and CD-Tag.

{application name} - Illegal System DLL Relocation

The system DLL user32.dll was relocated in memory. The application will not run properly. The relocation occurred because the DLL C:\Windows\System32\Hhctrl.ocx occupied an address range reserved for Windows system DLLs. The vendor supplying the DLL should be contacted for a new DLL.

A hotfix is available from Microsoft (related links, below)

Apparently, Microsoft decided to release this Windows patch even though they were aware of the issue. The patch addresses a problem that is quite dangerous - the "ANI cursor" or "animated cursor" security flaw - and, as of this date (4/12/07) over 2000 web sites have been rigged to exploit the flaw and attack your computer when you visit:

More than 2,000 unique Web sites have been rigged to exploit the animated cursor security flaw in Microsoft's software, according to security vendor Websense.

Thus making it even more important that you apply the update!