Yep. Your Windows 2008 R2 server wont boot. This is quite common if you mistakenly make your C: partition active when no bootmgr is on this volume.

Steps to fix are:

1)  Insert Windows 2008 disk and boot from DVD/CD drive.

2) Follow the Install guide -> Select the Repair option -> Click Next

3) Choose the Command prompt and input the following commands:

Enter diskpart

diskpart

List the drives on this machine

list disk

Select the C:/ drive (normally disk 0)

select disk 0

List the partitions on the C:/ drive

list partition

When the partitions are listed look for a ~100MB partition – usually partition #1

select partition 1

Activate the partition

active

exit

reboot

That should do the job.