Yep..reload a save game before you equipped the item!
Unfortunately, there is no "cheap" way of unequipping cursed items without a costly trip to the Temple. Oh for the "Remove Curse" spell of Wizardry!
Staves and daggers are primarily the most cursed weapons you find early on in the game, so make sure you save before equipping, then reload if you find it's cursed.
-Sazerac