If you take a look at the System Requirements page
of Sitefinity you will see that we support SQL Server 2012, but we require .NET 4 Framework due to differences in WCF between .NET 4 and .NET 4.5. That been said, you would not be able to run Sitefinity on IIS8 which is the IIS version in Windows 8 and unfortunately cannot be changed/downgraded.
So the only way for now is to use IIS7.5 (or bellow) which is default for Windows 7 and Windows Server 2008 R2.
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