Discussion of hardware related issues
I was able to get Win10 directly installed, first by doing a base Win7 install then upgrading to Win10 20H2 which didnt take too long. Then you add your apps, settings, extras, updates and optimize the drive. Much longer process then installing Linux but I clone my drives to similar hardware which saves me some time.
Working on my wifes backup laptop and did some updating and cloning to a larger faster drive. Ive been impressed as both my Dell E4300 and E6420 are running Win10 with no issues, with good performance.
Figured out why the Dell E6400s wouldnt boot with some distros, Mageia 8 in particular. The bios in these laptops doesnt have virtualization/direct I/O enabled so the OS starts up looking for it and when it sees its off wont boot at all. Turn it on in bios and the system starts up normally and performance is fine.
Im a bit amazed how well these E4300s perform overall with 2.5ghz core 2 duo cpus and 8gb of ram, with 500gb WD Black 7200rpm hard drives. Win10 and Linux both run really well.