Can't download various files

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?
BG

You might want to try downloading a codec pack such as DivX

Please educate me. Is downloading a codec pack like DivX a way to remove all codecs? What function or solution will it perform or provide?
BG

It 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.