Updated Windows documentation

Ignore-this: 69535da9ed8c32bcd58b7117ee62a292

darcs-hash:20100707162056-56b4d-a758dfbeb6f0bc9058c0bee8c46333d2dd026712
Removed duplicated dependency

Ignore-this: ebedeb77141b34efbcb4c399dd27d8c6

darcs-hash:20100707162613-56b4d-72086c17f866aee49ef1039cb995097a99338f48