All,  We're seeing the same issues on Optiplex 5040 desktops and Latitude E7x70 Laptops (All coming with 8GB RAM and 128GB SSDs) We're running the latest Bios (1.2.7 on the desktop) and Win7 64bit / Office 2010 32Bit It seems to be Skype for Business (Lync.exe) that crashes then the display driver resets... we get the following in the event log although most users report that they are using Excel at the time of the crash. Faulting application name: lync.exe, version: 15.0.4809.1000, time stamp: 0x56cbfaf2Faulting module name: igd10iumd32.dll, version: 10.18.15.4279, time stamp: 0x55db7e87Exception code: 0xc0000005Fault offset: 0x000485a3Faulting process id: 0x1e54Faulting application start time: 0x01d1c255ddccd0a6Faulting application path: C:\Program Files (x86)\Microsoft Office\Office15\lync.exeFaulting module path: C:\Windows\system32\igd10iumd32.dllReport Id: 76d06a76-2e4c-11e6-85f9-1866da0201f0 Since our image was produced, Dell have released some new display drivers - the first one I tried from the Dell site did not fix the issue and neither did the Intel one but I'm now testing the one released by Dell on the 24th of May and it seems to have hopefully fixed it! For the 5040 this is version 20.19.15.4454 A07 (the previous one ended with 4390 A05) I notice that they also released an updated driver for the E7270 Laptop on the same date so maybe applies the same fix. 
We have 3 new Dell Optiplex 5040's ( i7, 8GB Ram, 500 GB HDD) with no addon gpu.  On all the computers the display driver randomly crashes and recovers while using Excel 2010.  I have updated to the latest display drivers, turned off hardware acceleration in Excel and extended the display driver timeout in the registry.  The registry fix made it longer between crashes but did not fix the problem.  Any suggestions?
Display Driver Crash on Optiplex 5040 using Excel