I don't know why that pop up showed up.
but to be safe i would have them run one of these reputable sites online scans.

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Free Online Virus Scan | BitDefender Online Scanner

Incorporating the BitDefender award-winning scanning engines, BitDefender Online Scanner is an on-demand antivirus and antispyware tool that shows how safe ...
www.bitdefender.com/scanner/online/free.html - Cached - Similar

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HouseCall - Free Online Virus Scan - Trend Micro USA

HouseCall is a free virus scanner offered by Trend Micro, which checks whether a computer has been infected by viruses, spyware, or other malware.
housecall.trendmicro.com/ - Cached - Similar


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Free Virus Scan - Kaspersky Lab

Scan your computer for viruses with our free online virus scanner. ... Kaspersky Lab: Antivirus Software and Free Online Virus Scan ...
www.kaspersky.com/virusscanner - Cached - Similar


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Virus File Scanner

Kaspersky Lab: Antivirus Software and Free Online Virus Scan ... your computer to a dedicated server, where it will be scanned using Kaspersky Anti-Virus. ...
www.kaspersky.com/scanforvirus - Cached - Similar


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Free Virus Scan - Free Antivirus Software | Norton Security Scan

Test your computer's exposure to online security threats with free virus scan. Learn how free antivirus solution can make your computer more secure.
security.symantec.com/ - Cached - Similar


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FREE ANTIVIRUS Online - Download ActiveScan 2.0 and clean your PC ...

Panda ActiveScan 2.0 - Free Antivirus. Are you really sure that your PC is not infected? ActiveScan 2.0 is an advanced online scanner based on Collective ...
www.pandasecurity.com › Antivirus Users
- Cached - Similar


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Free Virus Protection, Free Virus Scan | FreeScan | McAfee

McAfee protects you with the latest 2009 antivirus software for free with ... you would also terminate your agreement to use the McAfee Online Backup, ...
home.mcafee.com/downloads/freescan.aspx - Cached - Similar