Windows boot manager failed to start - message - a recent hardware or software change might be the cause. I don't have a repair disc and it will not reboot. Thank You L

Sorry to hear about the problem

I've used easyBCD to repair a windows boot manager, you may have to download it in another working machine, then burn it as bootable cd (using nero or similar image burning software), pop it in and when you start your computer make sure you have your cd/dvd drive unit as the first boot option so you go right into the cd ,

try the following instructions here to see if they may help, post back if you have further questions

repairing bootmanager

hope this helps

thank you!