Thank you for contacting Sitefinity support. Are you installing it from the zip file or from the MSI? Try installing Sitefinity using the msi installer, not just the project manager, and let me know if you have any further problems.
All the best,
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items