I checked your address here: https://blockexplorer.com/address/35j2dasvPaFTzExrnqqWYnho2jEJB4fjNM

This shows you have received one transaction for a total of 0.00463531 BTC. It doesn't match the amount you described, are you sure this is the right address?

How to export the private key was covered in several previous forum threads, most notably here: https://bitcointalk.org/index.php?topic=1079195.msg11522893#msg11522893