You can disable the guest account completely. To do this follow the steps below…
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Short Way…
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1. Click “Start”
2. Click “Run”
3. Type “control userpasswords2″
4. Press “Enter”
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Longer Way…
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1. Click “Start”
2. Goto “All Programs”
3. Goto “Administrative Tools”
4. Click “Computer Management”
5. Click “Local Users and Groups”
6. Double Click “Users”
7. Right Click “Guest”
8. Click “Properties”
9. Make sure the “Account is disabled”
check box has a check in it.
10. Click “Apply”
11. Click “Ok”
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it is almost impossible to completely disable ANY version of a guest account in windows: the OS uses it to bypass and share system files and shared network information, even if your machine does not have any of these things actively (set up by you) implemented. To completely disable it would make far more problems than the risk of having it partially working in the background the way windows has it set up.

The trick then is to disable to USER ability to use it or log on with it, and protect the system from unauthorized activity VIA the guest account addressing, by using a stronger firewall than ICF and protecting ones OS from malicious activity coming in as well as origionating (trojans, etc) from WITHIN one’s PC.

DIsable the guest accocunt, but remember, windows MUST have it for file sharing and network protocols- so all the “disabling” you hear about is simply a “visual” fix- but it still runs in the background, and so it can still be accessed by a sophisticated virus or hacker.

In most cases, the later isn’t a problem or an issue.