How to stable pc after unlocking???

My cpu is AMD Phenom II X2 560 BE 3.3GHz
RAM 4gb DDR 3
Main bord- MSI 760GM-p23

I tried to unlock cores from CELL MENU by Unlock CPuU core to enabled and ACC to auto.
But I'm facing few problem::

>after saving that setting pc reboots but the monitor doesn't display anything but the pc runs , then I clear COMS and start again

>then I use the same setting for second time then that works.

> When windows starts there show some new problems like: Screen start flashing in few minute, all the internet browsers start crash e.g: Firefox, Google Chrome ,Opera. i tried to run these three but crash. And the most importantly Windows Aero Transparency system doesn't work..

is that a problem for power or something else...

Please anyone give me some suggestion .....

if you have checked the CPU bath on the website, there are some CPU codes that can to unlock and some can't . . if it fails in unlock the overclock is the best way ... just a suggestion

it means your CPU fail to unlock ... try overclock