Okay, this version of Iridium Wallet should work.
Please let me know of any issues.

https://github.com/iridiumdev/iridium-qt/releases/tag/v1.02w

If you can't connect to any peers, please allow the .exe in your firewall.

Your wallet is stored at: C:\Users\USERNAME\AppData\Roaming\Iridium
Access this folder by typing %appdata% in windows, then going to Iridium Dictionary

To import an old simplewallet file, drag your .wallet file from simplewallet and rename it to Iridiumwallet.wallet