Guest account popup

When I go into my guest account, at start I'm poped up with a box saying "no cd rom drive found" and also a ATI Catalyst pop up, saying I don't have the preveligies to change any settings.
Can I do something so this popups don't occur?

Not directly an answer to your question re: popups, but you're really better off leaving the Guest account disabled, as it runs with elevated privileges and is therefore considered a security risk. Instead, create a Limited user account and call it something like "Visitor"... then set it up with restrictions as you like. If you have XP Pro, you can then use the Group Policy Editor to set restrictions on the "Visitor" account.

If you have XP Home, make the Visitor account Limited and look at either Doug Knox's Security Console or the Microsoft Shared Computer Toolkit...

http://www.dougknox.com/
http://www.microsoft.com/windowsxp/sharedaccess/default.mspx

I don't use the guest account, it's mainly for them who want to use my computer.
I got Security Administrator so I can set all preferences for the guest account.