Go straight to the recovery console from the Windows installation disc by holding Shift and F10 simultaneously on the screen after localization options. Then you can use these two commands on recovery console:
bootsect /nt60 all /mbr bcdboot c:\windows /s a:
Where c: is the Windows partition and a: is the partition marked as active. If there is no active partition you should mark the partition you resized as active. Change drive letters in command above according to your mappings.
The select disk
, list volume
and list partition
commands in diskpart.exe
can be used to display partitions mappings.
When Windows 7 is successfully booted, you can use a BCD manipulation utility such as Visual BCD Editor to examine/rename/delete boot entries.