Yatin,
Try this web site. There some drivers on the Hutch - Thailand site.
http://www.hutch.co.th/download/downloads/...for_Win_X64.zip
Contains 64-bit drivers for the EC321 and 325.
The main download page: http://www.hutch.co.th/download/index_en.htm
hope it works. All the best. Unless you already got hold of them.
~Talos