Hi lil mickey,
It could be macrium didn't fix the o/s drive letter.
The easiest way for you would be to use the paragon free rescue kit - there is a module that lets you change the o/s registy letter.
select normal mode- Boot Corrector -Search for windows installations - correct registry drive letter.
Unless you are a geek, the drive letter next to the Windows 7 volume label should be C.
If it isn't, change it to C. Rescue Kit Free Edition - CNET Download.com