USB\VID_­10D6&­PID_­ff51 drivers

Here is 3 drivers compatible with USB\VID_­10D6&­PID_­ff51.
This is Device ID of USB 2.0 (FS) ADFU Device.
Device or core chip manufacturer is Wilson .co .ltd .
Here is only last drivers for this DeviceId. Almost all of them are compatible with your hardware.
Anyway, you can try to use extended search exactly for your hardware.
Category:MP3 Players
Manufacturer:MSI (Microstar)
Hardware:MEGA STICK 543
Software name:RDiskUpdate
File Size:357.82Kb (366409 bytes)
Released:25 Oct 2006
System:Windows XPWindows 2000Windows 98Windows MEWindows 95Windows 98 SE
Description:RDiskUpdate for MSI (Microstar) MEGA STICK 543
This tool can update firmware,­ but please have to download firmware file first.­

Installation process:

1.­ Please download and unzip this tool.­
2.­ Please connect mega stick 543 into the PC.­
3.­ Please execute RdiskUpdate.­exe directly,­ after that,­ it can be used.­
Download MSI (Microstar) MEGA STICK 543 RDiskUpdate driver
Category:MP3 Players
Software type:Driver
File Size:11.61Mb (12170285 bytes)
Released:16 Aug 2007
System:Windows 98 SE
Description:Driver for Windows 98SEDownload X-Micro XMP3-R Driver 1.2
Category:MP3 Players
Hardware:Micro MP3 Pro
Software type:Driver
File Size:4.84Mb (5069934 bytes)
Released:23 Feb 2007
System:Windows 98
Description:Micro MP3 Pro for Windows 98Download Kanguru Micro MP3 Pro Driver