How to change Hash key ?

[VladAlex]

How can I change the hash key from project reality ? When I first install it , i used a cd key from internet . After some time I bought one from a friend , reinstall bf , pr , used CC cleaner(clean register) but nothing worked . The hash key remains the same even if I use a legit CD key

[Cassius]

Reinstall windows reinstall PR

[LITOralis.nMd]

There is a this method:

Battlefield 2 - Invalid CDKey Fix - Steam Users' Forums

start at :

How to fix this problem:
1. Step:
Start Battlefield 2 without changing anything.