codecs for Windows Media Player 10

I own a Dell DIMENSION 8200 - Pentium 4 CPU 2.26GHz - with 1 GB Ram (Asset Tag: DYZSM11).  My operating system is XP Pro with Service Pack 2

I used PhotoJam 4 Deluxe (by Shockwave) to create VideoCDs.

I have a Dell Pentium 4 with 1 MB RAM and XP Pro with Service Pack 2.

I recently downloaded Media Player 10.

I am (now) not able to view my VideoCD's (created with PhotoJam 4 Deluxe) using Media Player 10.

I received the following message: 'Windows Media Player cannot play the file.  One or more codecs required to play the file could not be found.'

The VideoCD's (that I created) play just fine on DVD Players attached to televisions.  However, the VideoCD's (that I created) do not play on my computer.

I have downloaded codecs from both the DivX and Microsoft sites.  (I hope I downloaded the correct codecs)  After that I re-booted my computer.  I still cannot view PhotoJam VideoCD's on my computer.

Where do I find the codecs to allow me to use Windows Media Player 10 to view the PhotoJams that I create on my computer.

Thanks for your help.

MarvR