Are you running dashcoind?
Wich OS are you using?
Which version are you using?
Running wallet from link in the OP.
Windows 7 x64
gui wallet version 1.1.1
EDIT: Dont bother. Gui wallet have bug. It showing me that i am downloaded all blockchain but it is not.
When i run dashcoind.exe its showing 68 days behind and gui wallet showing that is synced.
Run the dashcoin daemon first. Let it completely sync before you run the simple wallet.