[TYPO3-install] Can't access the Dummy site

[tintin at tintin.ws]

hi
     i installed the TYPO3 Winstaller.exe yesterday and able to access the
     Dummy Site with username & pwd typo3. Now I started my TYPO3
     Winstaller & can't access the Dummy Site. As far as I can remember, I
     change the Template yesterday & then Exit on it. Can i still access
     the Dummy Site? It's quite funny because the Quickstart Frontend &
     Testsite Frontend I can access on it.
     Does anybody have any idea why is this so? Has it something to do with
     the template changing?
     thanks