Okay, so my girlfriend got a copy of Skyrim for her PC. She'd like it to be on the highest quality, but the framerate is terrible, even on the lowest quality it is unplayable. Here's the info of the graphics card and whatnot.

Graphics card: ATI Radeon HD 4200 (with d3d9.dll in the skyrim folder from the performance download from skyrimnexus, NVIDIA Geforce 8800 GS is the new driver for Skyrim)
Processor: AMD Athlon™ II X2 240 Processor 2.80 GHz
Installed memory (RAM): 5.00 GB (4.74 GB usable)
System type: 64-bit Operating System

dxdiag:
Version: DirectX 11
System Model AY626AA-ABA p6314f

I don't know much about computers and drivers and all that, so if I am lacking any information for a possible solution, let me know. I've tried the CFF explorer and performance mod and changing the number on SkyrimPrefs, but nothing has worked thus far. Please help!

Please use your first thread for this:
http://www.gamesas.com/topic/1360432-help-needed-with-framerate/