Option if your HDD is larger than 1TB: *Move your boot files to a smaller partition at the start of the HDD. *Format the HDD and allow Windows to create a 100MB boot partition. *Shrink and move your partitions with GParted. Press Any key to read more
1. boot up you PC with windows 7 bootable DVD or pen drive.
2.then select > repair your computer
3. System Recovery Options screen will show
4. then select > Command Prompt to continue
now submit those command
1. bootrec.exe /FixMbr


you can try the following command to rebuild your BCD:
3. bootrec.exe /RebuildBcd
bootrec /RebuildBcd