Amnesia lags in the launcher and game menu

[Dave91]

Hi i have problem. When i execute Amnesia.exe i get to the launcher.. but in the launcher it lags like hell and even in the game menu. I could create a profile but couldn't choose it because of the massive lag.
Everytime i move the mouse it freezes for 1-2 sec (but when i touch nothing, nothing lags everything runs perfectly smooth, no frame drop or anything) and then the same over again when i move it. I tried to press Enter to choose the profile but then it lags again for 1-2 sec and i am still in the profile selection menu.

I have tried turning everything off, put everything on the lowest settings, turned off everything in the launcher who can cause performance issues. but still the same lag when i move the mouse or anything.

Really need help with this, because i'm dying to play it. From what i saw on youtube this has to be the scariest game of all time, awesome work Frictional Games! And its nice to know that you guys are swedish, like me he-he.

And yeah my specs are:

Pentium® Dual-Core CPU E6600 @ 3.06Ghz - 3.07Ghz
RAM: 4.00GB
Windows 7, 64bit
ATI Radeon HD 5400 Series (updated drivers to the latest one)

I can run crysis pretty smooth on high settings, and can run COD:MW2 perfectly smooth on highest settings.
So it must be a problem with the game supporting ATI cards i guess?
Or is there a solution?

Thanks in advance!