For decades the road to a fix has been research and trying the usual.
But why? The reason why is the Error Code does not tell us a lot. So far it takes a human and say google to find priors and then match up the error with the prior discussion and decide if that's a match then try what others did.
However for Vista I find the machines can be so old that they have issues that can't be fixed without a fresh OS install or fixing the hardware.
Your second question is about supportive tools or companies. To date I find all the makers to be supportive when paid. The problem is this may be cost prohibitive. That is, if you have a Vista PC and have to shell out over 200 just to get it working, why would you do that when for less you can replace the cranky PC? Example: https://www.groupon.com/deals/gg-cm-hp-probook-6460b-intel-core-i3-2350m-4gb-14-dark-gray-refurbished
My brother and I run offices and we are very keen about keeping costs in check. That is, if it looks like an office machine will cost more to fix than replace then we replace. This really rankles those that think repairs should cost less than a replacement machine or printer.
Cannot print due to Error 0x800f0243. Many companies say it can be done but which ones are reliable, supportive and cost effective?