WAS 6.3 b2 problems on WinXp

I'm also facing problems installing the latest beta. I get stuck at the point when it installs "SAP J2EE Engine Server Core". It fails with the well known: MUT-02041 SDM call of deploySdaList ends with returncode 4. I also followed the instructions from the FAQ (about rebooting and starting C11 manually) but the problem is that jcontrol.exe "Could not be started" (MMC). I can continue the installation clicking ignore but then I'm unable to deploy from the studio.

I'm also confused... in the FAQ it says that if you get this error you should start C11 from MMC and check that jcontrol is running... Isn't jcontrol.exe the "SAP J2EE Engine Server Core" (which is the current installation step)?

Regards,

Marko