Welcome to the forum, although we really don't get into PCs here except when used to cross-develop 65xx software or other ancillary uses.
In talking about your other "drives" (other than the C: drive itself), are these on physical drives or are they extended DOS partitions? If the latter is the case, your best tactic is to use Norton Ghost to copy those partitions to a different physical drive. Afterwards, you can mess with the C: drive to your heart's delight. It is possible to boot from the Ghost CD, which has its own self-contained Windows operating system.
BTW, for a permanent solution to the Windows problem, look up Rent-a-Dumpster in the Yellow Pages.