just go thru the normal motions... and make the normal partition as big as possible... (as big as the setup program will let you... take the defaults make sure you format it as NTFS and NOT FAT32

then any left over un-partitioned space, set that up AFTERWARDS (control panel, administrative tools, computer managed, storage devices)

or do what i do... DONT BOTHER leave the unpartitioned space there and only bother to partition it if you actually even NEED it... as it confuses me having more than one drive/partition on my PC... lol