embedded MP3s won't play in IE

[maglinders]

Problem:
MP3s embedded in (my own) web pages suddenly won't play in my IE6 under XP home. RealPlayer 'General error' message box pops up. Clicking on 'More info available at RealNetworks' (or whatever) button in the notification box does NOT load the real.com page.
I remade a page, re-uploaded its MP3, uninstalled and reinstalled realPlayer. Still won't play.

Diagnostics etc. tried:
Overnight McAfee VirusScan found a virus (or it may have been an unwanted program, can't recall) which VirusScan automatically deleted, but which seems to have been somewhere in my SoundEditPro. I uninstalled and reinstalled that too.
Now I have IPSentry which McAfee says is harmless. (Grr - all this crap getting through my firewalls... )
Running AdAware only brings up tracking cookies, nothing sinister.

Any ideas, please?

(I make free websites for young singers, so this is a real pain in the *ear.
e.g. http://www.iestyndavies.com/ )