Just yesterday my PC decieded that it didn't want to download any mpeg files from the net. It tells me that it is requesting new codec and then I get an error message "invalid class string". I have good antivirus and anti-spyware so it isn't because of that and I uninstalled and reinstalled Windows Media Player with no results. HELP
BG.You may be blocking Windows Media Player with a firewall.

I don't have a firewall installed.That's mistake number one so far.

Does this occur to all .MPEG files?

Have you removed Codecs?It appears to occur with all mpeg files. I have not removed codecs. How do I do that?
BGYou might want to try DOWNLOADING a codec pack such as DivXPlease educate me. Is downloading a codec pack like DIVX a way to remove all codecs? What function or solution will it perform or provide?
BGIT will install Codecs that you may need to watch .MPEG files and others.Raptor,
If I GO to DivX.com I only see a bundle pack that includes the DivX player which I already have and a DivX Pro codec. Is that what you are referring to?Raptor,
By the way, I love "It was the machines, Sarah"!I'll be back.

If you have allready tried installing DivX player (Which contains additional codecs) you can try restoring the computer to a point where the problem did not yet occur. It is not something I would try, but it might work.