Reshade/SFX creating screenshots in game folder

When I'm running Reshade/SweetFX then my game runs at 0 frames persecond, it's not frozen though, the game still reacts to input every 10 or so seconds. While this is happening Reshade/SweetFX is creating an unlimited amount of screenshots in the game's folder, I just had to delete 2GB worth of screenshots from my HL2 folder. Each screenshot was a 7MB big BMP file.

This happens with every version of Reshade/SweetFX and in every game I've tried so far.

What I've tried so far:

Removing every USB device.
Removing every other cable except the power and monitor cable.
Reinstalling Windows with formatting my HDD.
Turning off background programs except Steam and Avira AntiVirus.
Updating drivers and DirectX etc.

My PC:

Windows 7 64bit
Q6600 @ 4 x 2.4GHz
4GB DDR2 Ram @ 800MHz
GTX 1070 Phoenix with 8GB VRam