Multiple Problems w/WMP & WMC regarding Xbox360 & PC! How do I fix?

Issue 1: Xbox and 2 of 3 user accounts on pc aren't displaying MP4, Mpeg, M4v files in Windows Media Center (Only my account on pc will display these files in "Folder" view. All accounts will display these files under "Date Taken" view)

"Solutions" Tried:

1. Re-registering Video codecs List of regedit's used: http://pastebin.com/sj4smU7P
2. Turning Windows Features On/Off WMP and WMC
3. sfc/scannow in elevated command prompt
4. Removing and Re-adding Media Extenders
5. Clearing WMP appdata
6. Clearing WMC Program Data
7. Restarting WMP and WMC services
8. Microsoft Fix It Tool
9. Both WMP Troubleshooters
10. Clearing Xbox Cache
11. Deleting and re-downloading Xbox "old" optional media update
12. Deleting and re-downloading Xbox"new" optional media update
13. Deleting Xbox Windows Media Center located under Games and Apps
14. Deleting WMC Users located under C:Users/Mc"___"
15. Re-locating my video library and accessing WMC in that new media library location

THREAD WITH SAME PROBLEM:
http://social.technet.microsoft.com/...f-e903b87a3efe

ISSUE 2: Xbox streams some songs in slow motion

"Solutions" Tried:

1. Re-encoding audio files
2. Re-downloading audio files
3. Deleting WMP Playlists and remaking them
4. ALL Solutions in Issue 1 Above

THREAD WITH SAME PROBLEM:
http://forums.xbox.com/xbox_forums/xbox_support/f/30/p/312497/1639444.aspx

If anyone knows how to fix any of the issues listed above please respond!

bump still no replies and I still need help =(

I have no clue about the xbox, but have you considered a repair install? Granted...... thats a last resort but an option nonetheless. Someone else here may have a more relevant fix so you may want to hold off on that for a bit. It looks like you've tried most of the other things I would have suggested already.

How long has this been happening? Have you tried a system restore to a point to before it started?

This has been happening for a VERY long time now and I'm getting annoyed by it unfortunately... I can't do a system restore because there are none... And yea a repair install isn't an option ever. .. So if anyone has any other ideas please respond thanks.

I first tried using the WMP to stream movies into my PS3 and it was nothing but hassle after hassle, with it either burping, farting or indexing it never worked efficiently and became frustrating very quickly.
There are other media servers out there that should work with the xbox just like the ps3.
I just googled "XBox Media Server" and came up with options that should work much better than that WMP or WMC.
I don't use the WMP at all but use the PS3 Media Server to stream into my PS3 and then into the TV and it works very well.

Here is a couple of examples of the google search
How to Stream Media to an Xbox using PS3 Media Server
Plex - A Complete Media Solution

You can research further but IMO you should dump the WMC and WMP and use some other more reliable media server and save yourself all the hassles.

I know I can do this but the whole reason I switched to WMC was because of this lol. The fact there is no gui and it is more difficult to navigate... Anyways nice try but still doesn't solve my problem... Any other solutions that don't require me reinstalling my entire OS or using another program? Maybe a regedit I don't know about idk???

bump...