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Q: The power supply in my 16-year old computer died suddenly, and I decided I’d rather buy a new one than replace the bad component.  The new system has plenty of drive bays, and I have lots of spare cables from the old machine, so I plan to install the old drive in the new machine.  The question is, will I be able to run my old software?  Also, will it be a problem having an active partition of Windows 10 on the old drive at the same time as the new computer has Windows 11 installed? Finally, in setting up the new PC, should I restore it as a backup of the old PC, or set it up as a new PC?

– Sandy A.
Saukville, Wisconsin

A: In the interest of full disclosure, dear readers, I must tell you that “Sandy A.” is actually my older sister, who, despite both of us being in our 60’s still has the stones to call me “Little Brother”.  I tolerate it though, because I take every opportunity that comes along to remind her that she is, and ever will be, older than me.

I’m going to answer the questions a bit out of order from how they were asked.  First, regarding the operating system, once the old drive is installed into the new computer, even though it has a boot sector and a viable copy of Windows on it, the system will not act on any of that.  The files are nothing more than that – just files, like any other files, executable or not.  Everything that makes Windows what it is – the virtual memory pool, the registry, the kernel, fonts, customizations, etc. – will all be supplied by the new version of Windows, and completely ignored on the old drive.

In setting up the PC, I would firmly advise you to let go of the past 16 years, and start with a clean slate rather than trying to import from an old backup.  It’s impossible to predict how many dead registry hives, hidden malware, or other undiscovered problems you may be inviting onto your new PC by using the old one as a basis for the new one.  You could be taking your brand-new thoroughbred racehorse and converting it into an old broken-down plow horse by making what, on the surface, sounds like a reasonable time-saving decision.

As for your software, I’m afraid in most cases you’re probably going to have to do a re-install.  The reason is that a typical software install wizard does far more than simply copy the software’s aggregate files to your hard drive.  They also make entries into the Windows registry, create file associations, add entries to your Start menu, create background services such as auto-updaters, etc., and in some cases, load necessary support packages, such as the C++ runtime library, DirectX support, or other APIs.  Once your old hard drive is a simple collection of files instead of the bustling operating system it once was, all of that is “lost” and must be re-established in the new operating system environment.

Now that we have all that squared away, you have a decision to make.  Your old software installations, and that old copy of Windows are probably occupying a lot of space on the old drive.  You can convert all of that to usable storage by removing the old software and the old copy of Windows.  This should be a simple matter of deleting the .\Program Files, .\Program Files (x86), and the Windows folder on the old drive, along with all the sub-folders located beneath them.  But for goodness’ sake, be sure you’re on the old drive before doing any deletions, lest you trash your active working environment.  Alternatively, you can probably set up your machine to allow you to choose whether to boot from the old Windows 10 or the new Windows 11.  Why do that?  Well, booting Windows 10 would essentially be booting into your old machine’s configuration, and all your old software would be where you’ve been used to seeing it for the last 16 years.  The process to do this is somewhat technical, and far beyond the scope of a column where I’ve already answered your other questions.  For any other readers facing a similar situation, write-in and describe your situation, and I’ll see about providing some guidance.