Thank you for the bug report.

We tested our wallet in a PC running the 64 bit version of windows 7 it's working fine.

http://i.imgur.com/9hPVM0y.png

Our guess is that you have an anti-virus running and it's blocking the http connection.
Also, what happens when you access hashpaypool.com from your browser? Does it work fine?

If shutting down your antivirus doesn't work please PM us we will solve the situation.