Problems when running the DS on Lan in Windows Vista Starter

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Hello!
I've been having problems running DSLan on my computer.
I use the latest version (v1.3), but in my computer, I do the setup, everything OK, but it asks me an error in Apache, saying exactly this:

"It is usually allowed to use a single socket / port. Please check your settings.
Port 80
Apache could not be started "

By chance is a problem with my version of Windows (Vista Starter) or something else?

Please help me!

do you have skype open? or other servers?