I'm sorry for the delay mate, we had heavy snowing and had to deal with it in some nasty ways
You can follow this : http://software.intel.com/en-us/arti...ntel-graphics/ to build the "custom" intel driver. Just delete all the custom modelines as examples from the .inf file and replace those with 800x480 and 854x480 I wrote at 1st post. Don't forget to enable them as it says so in that article.
You might need to uninstall and reinstall the driver (not just reinstall over). Play with it.
If you still can't work it out, PM me and we can solve this over teamviewer maybe.
A bunch of colors scrolling through your screen means wrong timings so you're not using the DTD. I never actually got to use DTD Calculator in win7. It simply won't work. You might want to delete first the DTDs wrote by DTD Calculator.