I have Windows Media Player 11 on my Vista PC and Windows Media Player 10 on my XP Pro PC.
Using RegSupreme Pro's Software Manager, they show up as follows:
Vista - - Author= Software=Windows Media Format 11 runtime
XP Pro - Author= Software=Windows Media Format 10 runtime
Using RegSupreme Pro's Registry Manager, they show up as shown in the screenshot. It's the same on both systems (except, of course, one says 10 and the other says 11 :) ). Actually. on the XP system, it just says "Windows Media Format runtime" (that is, the number is not in the "display name").
If you have the "runtime" item listed by either tool, perhaps uninstalling it will take out WMP 11. It couldn't hurt to make a Restore Point first …
05-04-2008_10-11-54.jpg
BTW, the two keys are one right after the other in the registry. I speculate that jv16 only shows one item in Software Manager to reduce duplication in the list. Both keys point to the same Program Files folder, but have different uninstall strings. Namely, "C:\Program Files\Windows Media Player\wmsetsdk.exe" /UninstallAll and "C:\Program Files\Windows Media Player\Setup_wm.exe" /Uninstall.