Tried to restore it and its saying bootmgr is missing

http://www.techsupportalert.com/content/how-fix-bootmgr-missing-error-vista-and-windows-7.htm

How To Fix BOOTMGR is missing Error in Vista and Windows 7

Have you tried a System Restore/Recovery? Can you boot to safe mode? Try the restore/Recovery procedure: Shut down, unplug, remove battery, plug in, push the on button and When Acer splash is on screen hold Alt and keep pressing F10...

What is the make and model and what operating system?

try changing your CD/DVD ROM then install an OS

if you boot pressing F8 can you get to the repair option?

Sorry to say this but you will need to do a complete restore from DVD of your operating system. Vista is not as forgiving as XP where you can rebuild the boot sector - If you have your vista recovery disc's do a complete recovery >> sorry - from now on always do backups of data you need to keep weekly.

If XP, boot the XP CD, go to recovery console (R at first prompt) Type the command BOOTCFG /REBUILD
Microsoft instuctions are here:

http://support.microsoft.com/kb/330184

If Vista boot to the Vista DVD, and run a startup repair per this:

http://www.bleepingcomputer.com/tutorials/tutorial148.html

something has removed the bootmanager from your harddrive your going to need the windows cd, you can try useing the repair console to restore the bootloader, also you can try a repair install or a fresh windows install.