problem installing windows 7

system:dell studio 1558,windows 7ultmate,500gb hd
problem:cannot install windows all my partitions are in dynamic and im not having any os.
2.having partitions:7(5 main partition,,10gb unallocated 1 drive showing 2 times).
3.unable to format any drive,cannot install anywhere.
4.i am having an important drive which i cannot format.
5.is there any way to install windows 7 on dynamic drive.
6.any way to convert dynamic disk to bootable disk.
plz help thanks .
.urgent

When you reinstall Windows 7 select custom. Delete every partition on the disk. select that unallocated space for install.

unallocated space is 10 gb
2.im not getting the option to delete any partition

Convert to Basic Disk using the Win7 DVD Command Line: Change a dynamic disk back to a basic disk: Storage Services; Local File Systems