Granted Dell says that model (Precision M4400) has "not been tested" for Windows 10, and the problem (surprise surprise) seems to be the video driver. I grabbed the latest driver for my card from Nvidia and it didn't really improve things.
While I have other issues with Windows 10 (the shitty "apps", Twitter and Candy Crush auto-installs on my "Pro" version) I am impressed with how solid it has been for me even on an old and officially unsupported machine.
https://support.lenovo.com/us/en/documents/ht103535#thinkpad
Card is Intel Ultimate-N 6300 AGN Driver is 15.18.0.1 Date 30/04/2015
The only drivers I had to install were for the SD card reader (Ricoh) and an update for Audio from Lenovo as it is a later version than from Windows Update for some reason.
On my custom built machine at home I've had one BSOD since upgrading to 10 from 7 and that was when it was first released
Our Surface Pro 3s and 4s at work have been terrible though, they've always been kinda flaky with 8.1 and 10; I hate working on them