Announcement from Microsoft:

"We have recently discovered an issue with SQL Server 2008 CTPs that result
in SQL Server 2008 not starting or installing on Feb 29 GMT only. We
recommend that you do not run, install or upgrade this CTP on Feb 29 GMT to
minimize any impact in your environment. You can install starting on March 1
GMT. If you have an immediate issue that cannot wait until march 1st GMT
contact csskat@microsoft.com before taking any further steps."

IT IS NOT A JOKE!

I had problems all day because of this bug!