Before you start, you should probably make a backup of the current wallet files
Then, in Armory... click the "Import or Restore Wallet" button in the top right corner...
Select "Single Sheet Backup"... (you may also want to check the "test" box at the bottom before you do it for real)
select "Version 1.35c (2 Lines unencrypted)"... and enter your two lines of the root key...
Armory should then recreate the wallet. If you still have that wallet loaded in your Armory, it'll probably warn you and you can either Merge or Overwrite it...
Your best option is probably to click "Merge" and reset your passphrase
Then kick back and relax while it regenerates your wallet and then rescans the DB for your transactions etc.
side note: for what it's worth, a screen shot of your wallet root key is a REALLY bad way to store your root key... it's like the 12 word seed for other HD wallets... it should NEVER be stored digitally.