HL2 HDRbloom patch problem

[juno_first]

I know its an old game, though with a high res texture pack and fake HDR its gotta be worth another shot.
After installing the hl2r8hdrbloom patch which mimicks HDR with PS2.0, I get a sick look:

I've tried different drivers / settings etc.
Anyone any ideas how to cure this square purple disease ?

 

[juno_first]

very different graphics card too, must be the patch