Hi,
Do these to clear corruption and repair/replace damaged/missing system files.
Run DiskCleanup - Start - All Programs - Accessories - System Tools - Disk Cleanup
Start - type in Search box - COMMAND find at top of list - RIGHT CLICK - RUN AS ADMIN
sfc /scannow
How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
generates in Windows Vista cbs.log
http://support.microsoft.com/kb/928228
Then run checkdisk - schedule it to run at next start and then Apply OK your way out then restart.
How to Run Check Disk at Startup in Vista
http://www.vistax64.com/tutorials/67612-check-disk-chkdsk.html
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You also probably needed updated codec :
32 bit Vista?
Use CCCP, also download their free insurgent tool - and FFDSHOW.
CCCP codec and get the insurgent tool - free
http://cccp-project.net/
FFDSHOW - free
http://sourceforge.net/projects/ffdshow/
OR
64 bit Vista?
Read this 1st and either go that route or use the one below.
http://www.vistax64.com/sound-audio/152850-vista-codec-pack-32bit-64bit-media-player-codecs.html
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Or try these : Download - SAVE - go to where your put them RIGHT CLICK - RUN AS ADMIN.
For 64 bit use these :
K-Lite Codec Pack (64-bit) 2.6.0
http://www.codecguide.com/
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You need to know which you are using 32 or 64 WMP
Switch, Change or Set 64-Bit Windows Media Player 11 (WMP11) in Windows Vista x64 as Default
http://www.mydigitallife.info/2007/01/19/switch-change-or-set-64-bit-windows-media-player-11-wmp11-in-windows-vista-x64-as-default/
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And you can use this when needed as no codec is usually required.
VideoLAN - VLC media player
http://www.videolan.org/
Hope this helps.
Rob - Bicycle - Mark Twain said it right.