Unfortunately you must have ignored the warning that your HD was about to be converted to Dynamic Disk when you added a fifth partition after already having a maximum of four Primary. Dynamic Disks are meant to span the same partition over multiple HD's.
You'll need to move the data off of W, delete it then convert the HD back to Basic disk using the old verison of Partition Wizard bootable CD which still has conversion as a free feature on the Disk tab. pw422.zip ISO - Windows Live
Then convert C to Logical by rightclicking to Modify>Convert to Logical. You can then add within as many Logical subpartitions as desired. Logical partitions are meant for data and cannot be marked Active to accept System boot files, however because installing 32 bit Windows 7 will only update the boot files already on System partition it can be installed to a Logical sub-partition.