Need to remove drive(s) from extended partition

I have an extended partition extended across 4 1TB drives. No RAID... just a haphazard extended partition. I could not get my RAID card working, so this was the next best option for me.
The partition shows as a single 3.63TB drive in My Computer. The time has come for me to remove at least one drive from the extended partition. 2.00TB is in use and 1.63TB is free. I tried to remove / shrink what appeared to be the "last" drive in the sequence but it would not shrink to smaller than 100GB.
How should I go about making sure the files are moved to only 3 of the 4 drives so that I may remove a drive from the partition? Thank you for any help you can provide.

Windows 7 x64 Ultimate
1x 40GB PATA drive (Operating System)
4x Samsung 1TB drive
3x DVD-RW drive
AMD Phenom II X3 / AM3 MOBO
4GB RAM

Please let me know if you need any additional information.