Hi Deltafan. I went through all the frustrations with sweetfx then discovered that I had to install Microsoft Visual C ++ 2010 redistributable (X64 and X86) and also the 2008 redistributable. After that Sweetfx worked perfectly. Couldn't get the AA to provide a suitable effect, but boy the screen sure looks pretty now.
Still having terrible transparency shimmers (trees etc). I am running Win 7 Home Premium 64 Bit and Zotac GTX570 Amp and I5 3750k clocked at 4.2.