My website has been reported as an attack site! How do I fix

Help! My website has been reported as an attack site. I suspect that some malicious code has been hacked into it without my knowledge. Google blocks it with a warning page and provides a small amount of information, but they don’t identify the source of the problem.
What is the quickest and surest way to fix this problem?
Answer #1
Contact google about this.
Or remove the virus script from your website.
Answer #2
assuming you have a local copy of your site
completely delete your on-line site and re-upload the local copy