The following are the supported platforms for this service

Operating System Windows Media Player Version Internet Explorer DirectX
Windows '98SE 9.00.00.3250 6.0.2800.1106 + SP1 9.0C
Windows ME 9.00.00.3250 6.0.2800.1106 + SP1 9.0C
Windows 2000 9.00.00.3250 6.0.2800.1106 + SP1 9.0C
Windows XP 10.00.00.4036 6.0.2800.1106 + SP1 or upgrade to XP SP2 9.0C
Windows XP SP1 10.00.00.4036 6.0.2800.1106 + SP1 or upgrade to XP SP2 9.0C
XP Media Center Edition 2005 10.00.00.4036 6.0.2800.1106 + SP1 or upgrade to XP SP2 9.0C
XP Media Center Edition 2005 SP2 11.0.5721.5145+ KB900325 + KB925766 7.0.5730.11 9.0C
Windows XP SP2 11.0.5721.5145 7.0.5730.11 9.0C
Windows Vista 11.0.6000.6324 7.0.6000.16386 10.0
Apple-Mac / Linux Not supported Not Supported

To discover what revisions you have:
Operating System and Revision:                        (Right click "My Computer" / Properties)
Internet Explorer Version:                                 (Open IE go to Help/About Internet Explorer)
Windows Media Player Version:                          (Open WMP go to Help/About Windows Media Player)

Windows Media Player can be upgraded here.
Internet Explorer 6.0 can be upgraded here.
Or Internet Explorer 7.0 for XP here.
Windows Vista currently has the latest revisions built in.