windows bootloader - need help

[sman]

has installed win10& win 8,1 on mt acer pc on multiboot, both both not wrkg well.  so want to install win7 in  one drive, but gow to go abt w.o corrupying booyloaderm is the  quesyion? any suggestions> tks

It's long since I use bootloaders etc. and as far as I remeber there is a sequence to it, lower versions first than higher or so, else boot loader can getcorrupted..

And need to install a scanner/printer to the pc and prefer to go with win 7 for it and how to go abt is the question? the boot sequence and the boot drive 8.1 is a minimal drive hardly 20-30 GN and how to increase it's size and install win 7 in it, keeping the other win 10 as it is? 

Edited November 24, 2020 by sman

[sman]

Found this on howtogeek site,

Quote

Typically, you should install the newer operating system last. For example, if you want to dual-boot Windows 7 and 10, install Windows 7 and then install Windows 10 second. However, this may not always be necessary — installing Windows 7 after Windows 8 or 8.1 seems to work.

now, is it ok, to go ahead and resize drives and install 7 in win 8,1 drive? tks .

it's not clear, if a drive already exists, can one install a diff lower version in it? as the article saus only abt mutiboot installation and not abt any reorganizationn, later?

Edited November 24, 2020 by sman