In addition to removing the malicious code, it is essential to find and fix the security weakness that allowed the site to get hacked. Until you do that, the site can get hacked over and over again. Although the security problem can be at the host, it is many times more likely that it is either a problem with your site or due to a site administrator’s PC being infected with spyware.
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How to remove ‘This site may harm your computer’ from your website’s Google results: http://25yearsofprogramming.com/blog/20071223.htm
How to prevent your site from getting hacked, repair damaged site. Website security precautions: http://25yearsofprogramming.com/blog/20070705.htm