BleepingComputer.com: Vids won't stay in slow-mo

Hi,
In Windows Media Player and Media Player Classic there are keys to make a vid run in slow motion, but when running the vid in continuous loop mode, the speed reverts to normal speed after each playback.
How can i lock it on continuous looping slow-mo?
Example- I shoot a vid of about 15 seconds soccer action off the TV screen, then download it into my PC to watch it loop in slo-mo, but it won't stay in slo-mo.
I'm Win XP Home.

You can try quickly edit with windows movie maker(Shouldn't take long to edit/produce) then just loop it.

Thanks, will psyche myself up to have a crack at it..

WMP11 - checked with WMVs and MP3s, but MPGs seem to be problematic, (options greyed out).

Just to recap:

Click Play menu on Menu bar above Player title bar for Slow/Normal/Fast (that's in Classic Menus mode - Control + M to switch views, or right click on Player title bar, select 'Show Classic Menus)

Click icon at bottom, second from left -'Turn Repeat On'

OR

Click the down arrow under Now Playing.
Point at Enhancements.
Click Play Speed Settings.
Select Slow/Normal/Fast or Click the blue line anywhere between 0.5 and 2.0 to vary play speed of media.

Click icon at bottom, second from left -'Turn Repeat On'

Keystrokes:

CTRL + SHIFT + S for slow speed (0.5x).
CTRL + SHIFT + N for normal speed;
CTRL + SHIFT + G for fast speed (1.4x);
To fast forward (5x), press CTRL + SHIFT + F.
To revert to normal speed, press the same keys again.

Click icon at bottom, second from left -'Turn Repeat On'
Hover mouse over icon - should now say 'Turn Repeat Off'

If these functions aren't working, perhaps a reinstall of WMP might help.