What I've done is uninstall RealPlayer and install Windows Media Player V10 & everything works fine.
My problem is I'm not very good with tech stuff. That's why sites like these are invaluable.
A tech guy installed all the software on my old desktop & when I bought my brand new notebook, Windows xp was preinstalled.
I've only just found some of the other programs & downloaded the appropriate updates. (I'm surprised I've had to do this as I'm always getting messages to say updates are ready to install).