A hard drive doesn't know whether it is in a desktop or a laptop. Two options:
1. If installing the OS yaself, just set the partition size you want for C:\ and install Windows.
2. If already installed using an older OS, try a 3rd party partitioning tool.
3. With Windows Vista or 7:
http
/techpp.com/2010/01/19/how-to-partition-a-hdd-hard-disk-in-windows-7/