Hi Catty
Have you Quicktime or Realplayer on your Start menu?
I have My computer set up to automatically choose the Best Program to run The Clip
Better than half the time Real player is chosen then Media player then Quicktime
Only one I don't like using is WinAmp which attracts Spam if you are not cautious

Get rid if you have this

There is no harm in reinstalling all 3 again If you have them They will all return to default settings and overwrite with no Probs
Quicktime Player
http://filehippo.com/download_quicktime_player/ quote:
QuickTime Player from Apple allows the playback of quicktime movies (.mov) and many other formats:
The new QuickTime Player not only delivers startling quality, but it's easier to use than ever. It requires no set up for content that streams over the network. Instead, QuickTime Player automatically determines your system's connection speed and chooses the highest quality stream for the amount of bandwidth you have available. And if you ever lose a connection while watching streaming video, QuickTime Player automatically reconnects.
Realplayer
http://filehippo.com/download_realplayer/quote:
RealPlayer (renamed from RealOne) allows your system to play Real Media files (.ra .ram)
This new version also allows you to buy and download music that plays on more than 100 portable devices, including the iPod.
RealPlayer is a digital-media player for finding and downloading new music, playing and managing audio and video clips, and taking your digital entertainment with you. RealPlayer offers a streamlined interface that allows you to keep your media library close at hand. Keep all your digital-media clips organized in one place; save CD tracks with one click; pause and rewind live streams; transfer music to CDs and portable devices; and enjoy clear, smooth video playback and multichannel, surround-sound support.
Windows Media Player
http://filehippo.com/download_windows_media_player/ Tip Download Version 10 as its half the size and near Identical to Version 11

quote:
Windows Media Player is the all-in-one media player that provides the best experience for discovering, playing, and taking your digital entertainment anywhere--on Windows XP-based PCs and the widest choice of portable devices.
The Player provides faster access to top activities, such as ripping, burning, and syncing. You can also fine-tune the layout, choose from a range of online music and video stores and services, and much more
Last tip .... Make sure that Windows Media Player remains the default player and the other 2 are
Not set as Default.(they are alllisted as "Enable access to this program" on the Set program access list, and B) the default is set as
"Use Current Media player" in the Custom section
Should run smoothly now with No request prompts for file types

PS I upgraded Windows media player from version 7 to 10 the other day and The Windows update downloaded a few security patches Later .Nothing to worry about.Allow them to install.