The mirror site is not necessarily in India or neighboring country, try any mirror until you find the one that works. Anyway, as far as I know you can use Autodock/Autodock Vina within Windows 7 without having to install Cygwin, unless if you still would like to try the one that uses Cygwin then that's OK.
Autodock 32 bit & Autodock Vina 32 bit is still working under 64 bit operating system.
Working in CygWin is really painstaking task. If your objective is to run AutoDock, I would advise to use windows based interfaces that run autodock. Many of them are freely available. You can try PyRX at http://pyrx.sourceforge.net/downloads or even VEGAZZ runs effectively (http://nova.colombo58.unimi.it/cms/index.php?Software_projects:VEGA_ZZ:Download.) These software runs very efficiently on even windows 7. Hope this helps..
