There are no intentions from Intel to develop new drivers for Windows 7 due to discontinuance of the board. Thank you for your understanding:
My best advice based on a bunch of hours of testing:
Roll your BIOS back to ECG3510M.86A.0084.EB and turn off AERO by going to Personalize and selecting a BASIC theme. Grab the latest Motherboard Video Drivers and Chipset Utilities and it should stop most of the crashing. You may still see some unusual screen states when the screen saver kicks in. Things like partial browser displays.
There appears to be some serious problems with the DG35EC BIOS and video drivers when you load WIN7. I have tested all of the drivers up to current and they all fail with Win7 after 86A.0084.EB in the same way.
You may have better luck getting a 3rd party video card and not using the DG35EC on-board video.
I have two of these systems and they both have the same problems and fail the same way. Intel's decision not to support Win7 with this motherboard and its processors given its market timing of this product is a big black eye in my book. My systems built after these two are ASUS boards for that reason. They run just fine with Win7.