Arrétes de te faire chier avec powerstrip. Fais cette modif ds la base de registre et t'auras plus jamais de prob de taux de refresh (sauf si tu changes de drivers, la il fo recommencer).
Go into Regedit, find key:-
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E96E-E325-11CE-BFC1-08002BE10318}
Under there will be folders numbered 0000, 0001, etc. The highest one will be your current monitor setting. Open that folder and there's another one called MODES, and a further one that will be the max resolution of your monitor (e.g. 1600,1200)
In there is a key Mode1 with a value such as
27-96,55-160
Change the highlighted value to your desired refresh rate
Now repeat the process for all your folders CurrentControlSet, CurrentControlSet001,CurrentControlSet002