I have tried that approach. I get inspirion 3880 No bootable device found error. There is no legacy boot option in 3880 bios. I can boot using same thumb drive if it has 64 bit os. I really don't care about 64 bit s/w as all of mine are 16 or 32 bit. i have also been trying using modified windows 10 64 bit s/w which allows me limited 16 bit ntvdm. But it is not nearly as good as real ntvdm on a 32 bit machine. The best option is to downgrade from win 10 64 to win 10 32. win 11 does not offer 32 bit so I will never upgrade. Having only 4gb of memory vs 12gb is a choice I can live with if I can get my 16 bit apps to work.