I just downloaded the Belkin software, installed it, and my N50 seems to be working fine. No need to hack the registry, the correct OEMName is there. Belkin : Support F8GFPC100 Nostromo SpeedPad n52 - Software and Drivers
Version: 3.2.4, OS compatibility: Windows XP 32-bit, Windows Vista 32-bit, Windows XP 64-bit, Windows Vista 64-bit, size: 9.87Mb
Thanks to all for the help I found here!