I installed Windows 7 from an existing Windows Vista installation (not through a DVD boot).
On the original Windows Vista installation, the partition I'm installing to is listed as D drive. After Windows 7 installation is completed, I realized that the Windows 7 had used D as the drive letter for the system. It runs perfectly fine, just annoying when you have everything on D (instead of the regular C).
Is there any quick painless way of renaming this system drive letter to C? I'm also considering the option of reinstalling from my Vista installation (it is on a different partition, so it is still intact), but would like to know which step it is that will use C as system drive letter?