Locked out of SSIS Package

I tried to access one of my SSIS packages only to be presented with the error message (Text in square brackets is not literal):

Error 1: Error loading Package.dtsx: Failed to decrypt a package that is encrypted with a user key. You may not be the user who encrypted this package, or you are not using the same machine that was used to save the package. [path to file].[Package].dtsx

Error: 2 Error loading 'Package.dtsx' : Failed to remove package protection with error 0x8009000B "Key not valid for use in specified state.". This occurs in the CPackage::LoadFromXML method.[path to file].[Package].dtsx

It also prevents me entering the package completely

Screen When opening package:

The problem is that your package was encrypted by a user. This could have been you are you loging in to the pc with a diffrent login or from a diffrent machine? Your not going to be able to open it until you figure out who encrypted it or from what account it was encrypted from.