Cheat Engine

[jox]

Installed: Cheat Engine 6.1

Environment:
Os: win 7 x64
Proc: Intel Core 2 Duo
Settings: kernel mode debugger (DBVM / dbk64.sys)
I can find a string in memory (tried notepad.exe)

For the two menu items below i always get empty windows.
- Find out what accesses this address
- Find out what writes to this address

Question 1: what can be the problem?
Question 2: how can i set up the other two debuggers ( windows and VEH)
for Cheat Engine 6.1 in the same enviroment?

Thank you for your help.