%A021_DESC_STR% = PRISM_A021, USB\VID_083A&PID_4502 Siemens Gigaset USB Adapter
NetChip (v1) based devices did not work (the system failed with a BSoD). It has been tested to work fine in 64-bit Windows 7 with a subset of the v2 (IS元887) devices.
Note that NDIS 5 compatibility was removed in Windows 8.1 ( source).
(maybe also Windows 8 if you can still use NDIS 5 drivers). The driver has support for 32 and 64-bit Windows and should work with Windows 2000, XP, Vista, and 7
These should be the latest drivers (version 3.03.41.0) available for 54Mbps PRISM USB devices.