Something for you to consider is that just ONE anti-virus/malware/trojan program does not catch all the little buggies.
I have Malwarebytes, and Microsoft Security Essentials, and SuperAntiSpyware. I have had several times that each program found different problems and removed them.
You can never be too safe.
Yes. I assumed he already had a virus software. I use Security Essential + Malwarebytes. Not familiar with SuperAntiSpyware so I will check that one out. Thanks