I receive dozens of these emails (from different people) a week. Basically, I recommend that the infected parties:
- Change their email password
- Do a deep anti-virus/malware scan of the computer you were on when you clicked this link. If you don't have a good anti-virus scanner, I recommend the free version of Malwarebytes Anti-Malware. It's available at: http://filehippo.com/download_malwarebytes_anti_malware/
- Clean out your browser cache, cookies, and history. The easiest way to do that on an ongoing basis is to use CCleaner on a regular basis. It's free and available at: http://filehippo.com/download_ccleaner/
- Don't click on any links like this in the future. Beware of any message that doesn't contain some personalization to convince you that it actually came from a real person and not a Malware robot. To be extra safe, I recommend that you install "Web of Trust". It's free and available at: http://www.mywot.com - It's no substitute though for "safe surfing" practices - avoid promiscuous link clicking and attachment opening!
- (Optional, but nice) Send an apology to the folks in your address book.
- HIGHLY RECOMMENDED: Switch to a safer email provider. I recommend Google's Gmail. AOL, Yahoo, Microsoft and their supported domains are highly insecure and are prone to break-ins. Gmail is a lot more secure, faster, safer, and still free. Easy to switch to and use, but has a lot more features. You can set a "Forward" in your old account's options so all your new mail will be forwarded - so you can take your time letting your contacts know about your new email address.