Thanks ewemoa. Both are very helpful.
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might try something like this (same idea as suggested by rjbull & jdd) - the cables shown in that TC link seem to be focused on copying stuff from older pc to newer one - in fact at least one of them seem to simply start copying stuff automatically according to an amazon review. They all work with their own software
Is the usb drive big enough to hold two copies of what you need? If so keep a fully archived passworded copy and each time you sit down to a new PC extract the contents of that archive. That way you can be sure the programs themselves remain uninfected.