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There are several ways someone can invade your system: * They can exploit an open port on your system that has a vulnerability. Windows is known for having a number of these, such as the IIS Web server. There's also the file sharing system. You should turn any and all of these off. * Or an intruder can put some sort of hostile program on your system. Viruses are an example of a hostile program. You can get others through ActiveX on Web pages, Web scripting and so on. The good news is that that is really it -- those are the two ways someone can hurt you. You absolutely *must* run a virus checker. It doesn't really matter whose you use. McAfee, Symantec and Trend are all perfectly good. They all update themselves automatically, too. Get one, especially if you've been hit before. You don't need me to tell you that. You can also get personal firewall software, from the antivirus people, and from other companies like Network Ice. To find out what you might have running that you didn't realize, Gibson Research has a free service they call Shields Up! It is a Web-based scanner that will check your system for open TCP/IP ports that may have vulnerabilities. Systems that are known to be secure are secure by simple means -- they don't run any servers that can be exploited. The odds are that you don't want to do so either, so you should turn them off. Not running that software is the best way. It wouldn't surprise me if you installed IIS without knowing it, and people used that Web server to hack into your system. Knowing what to do to turn things off is easier said than done. You need to do a bit of reading. Microsoft has some resources. Since you have been attacked, you should also read up some general articles on how to secure Windows 2000. Look at the SANS library < > for a lot of good information. Also look at SecurityFocus and SecurityPortal. Some more articles can be found at Ars Technica, and another good article at System Experts. I hope all this helps. Remember the basics: * Don't run any server software you don't need. If you need it inside your house, use a firewall or something else to make sure only specific people can use it. * Don't run strange programs. Yeah, that's hard, but get a virus scanner, turn off ActiveX in your browser. That takes care of most everything.
Dig Deeper on Windows Security: Alerts, Updates and Best Practices
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