Danielle,
A lot of times, those "virus warning" pop-up windows are actually adware disguised to look like real warnings. don't open those because they can download more crap on your computer.
I'd first run a scan using whatever virus software is installed on the computer (McAfee, Norton....etc. Just make sure it's up to date first!). If that doesn't find anything, you could download one of the free adware removal programs, like Ad-Aware (there are many others too) and run a scan with that and see if it finds anything.
Replacing a DVD burner on a laptop can be expensive since they're sometimes proprietary and have to come from the original manufacturer
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