When i change the resalution to 800,600 using ChangeDisplaySettings(); but after i switch back like this ChangeDisplaySettings(NULL,0); my resfresh rate goes down to like 60hz anyone had this befor?

This happens most often when your arguments to the first ChangeDisplaySettings are wrong. For example, you don''t want to update the registry. Also, make sure you pass CDS_FULLSCREEN.

Also beware which application and window is active when you change back.

But, yeah, some broken drivers just makes this happen, always. The best solution is to read the current display mode and save it, then ChangeDisplayMode to what you want, then when going back, explicitly ChangeDisplayMode to what you initially got, instead of using the defaults.

Oh there we goo
Thanks!~