DVD Decoder Upgrade

I get a Pop up window that looks suspicious at best. it says, "DVD Decoder Upgrade". Says it is the "Help and support center for windows XP".
It gives me two choices of what to do:
Go to the Web site to download an updated decoder, or
Create a desktop shortcut so that you can upgrade later.
I do not have a DVD Player or recorder.
Can some one tell me if this is a bonnified deal from Microsoft, or is it a Virus of some kind, and how to get rid of it from popping up.
I have Add aware, and Spy bot, which neither shows it in their scans.
Neither my AVG nor the trend house call online virus scan comes up with this. Thanks for info on what this is, and how to get rid of it.

If it only happens when your online then it could be a messenger spam can you post a screen shot?

Win XP pro, sp1
AMDAthlon Xp6.43GHz
Memory: 256MB
Hard drive: WD 6GB
CD rom and CDRW drives.

I do not get any Error messages, just the pop up web page as described above.
How do I do a screen shot?

When you get that popup, hit the button above INSERT, called PrntScrn.

Then go into a pic editor like Irfanview or Paint and do a CTRL-V.

Save as JPEG.

Regards

Hong

The pop up is an advertizing for Intervideo win dvd. not a clue how it got installed, must have been part of something else i downloaded. trying to uninstall it from add/remove programs.

The InterVideo DVD will not Uninstall from the add/remove in conterol panel.

If I go their website and download the free trial version will that "fix" what ever Uninstall files seem to not be working and let me then try to uninstall it again?

Or can someone post the steps to manually remove it from the system registry? In times past I got instructions from McAfee to manually delete an older version of their antivirus from the registry before I could install a newer version.
It went well, so I feel I can follow similar steps for deleting the Intervideo dvd if someone can help me with the steps to do so. thanks