Windows 7 will not start : could be due to a recent change in hardware

Hi, i have a home build computer i made myself. it is about 3-4 months old if that. and has been working fine. i was on it last night and did a proper shutdown and went to bed. i come home today and try to start and it gives me a message saying windows cannot start due to recent hardware or software change. i have changed nothing... and it gives me the option to run startup repair or star normally. starting normaly loops it. i am running the repair right now and awaiting ressults. Also i tried the F8 option and it does nothing but go to a small menu asking to boot from the HDD or my CD drive. PLEASE HELP. i doint want to lose my Gaming PC i worked hard to build : /