I used this method (by changing the values) on my 64bit and worked just fine, I'm writting it down just in case we did something different. Hope it works for you.
Step 1: Run your game and load your preferred char.
Step 2: Run Cheat Engine, select Hellgate in the processes and open it.
Step 3: Insert in the value box at the left your current palladium and press "First scan".
You should get this screen.
Step 4: Go to vendor and buy something, doesn't matter what, just anything. Return to CE and now fill in the value box your current palladium value and press "Next scan". Now you should get less addresses (I got 6).
Step 5: Click on each address to transfer them in the box beneath. Should look like this.
Step 6: Click on the value in the lower box and write the amount of palladium of your choice. Do this for all the values and fill in with the same amount for each of them.
Step 7: Reopen your inventory and check if your amount of palladium has changed. Try to buy something from the vendor to check that it worked.
There's a chance that you get a graphic glitch,not sure what causes that, so be sure to make a backup of your char. Good luck!