You have a working template but you want to install new windows updates and re-template it. You installed updates then started to update step. But what is that? Sysprep hangs on %49. Then SCVMM gives this error:

Unfortunately you can’t sysprep a Windows Server 2008 with SCVMM more than 3 times. Your licence does not accept sysprep after 3 syspreping. This is really bad but you don’t have any another way. You should create a new machine and then you should make it template. I don’t know what the exact number is, but Vista supports only 3 syspreping.