Malware detected on my Site in Dedicated Server URGENT

Hi: I need you to help me solve this. We have a new dedicated server since the beginning of July 2011, and we require all of our blogs to be scanned to fix this malware problem. When I try to access some of my websites this message appears: Warning: Something's Not Right Here! [login to view URL] contains malware. Your computer might catch a virus if you visit this site. Google has found malicious software may be installed onto your computer if you proceed. If you've visited this site in the past or you trust this site, it's possible that it has just recently been compromised by a hacker. You should not proceed, and perhaps try again tomorrow or go somewhere else. We have already notified [login to view URL] that we found malware on the site. For more about the problems found on [login to view URL], visit the Google Safe Browsing diagnostic page. If you understand that visiting this site may harm your computer, proceed anyway. Help improve detection of malware by sending additional data to Google about sites on which you see this warning. This data will be handled in accordance with the Safe Browsing privacy policies. We have 20 active blogs and this message is recurrently appearing in some of them especially in dforceblog.com. Please include in your quotation a software to protect our server, because we currently don´t have one.