What is the best way to deal with a suspected bot problem?

I got an e-mail from a friend of mine containing a suspicious link.   I did not click the link but contacted him to ask if he had sent it.   He had not.   I am guessing some kind of malware has infected his computer and sent e-mails to everyone in his address book.   What should I advise him to do about this?   I would like to know in case the same thing happens to me.
DoctorK12008Asked:
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wshark83Commented:
make sure they have the latest antivirus definitions run a full detailed scan (can take hours) if this doesn't reveal anything try using softwares like Malwarebytes and SuperAntiSpyware download the latest updates and then disconnect the internet and run a full scan.

it may not be system issue it could be that the person has opened a link in their email account (i.e. yahoo/hotmail) and thus its sent email from this to everyone in their address book... if this is the case then i would suggest they don't open emails or links from unknown people....as you can't get around this....
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pjamCommented:
If you believe you have a BOT, you can try Trend Micros free tool "RUBotted" at:
http://free.antivirus.com/rubotted/
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DoctorK12008Author Commented:
Thank you.   Simple, clear answers.
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pjamCommented:
You are welcome.  Good hunting.
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