+ 1 Votes The first place to look is some good books by O'reilly and the like Deadly Ernest Updated - 1 year ago and some google searches for training info. Also, Check your local tech colleges for some suitable courses. BTW The early versions of Windows, prior to Win 95, the GUI was an external app to the DOS kernel. + 0 Votes Been using those iExist 1 year ago I have been using some Linux rescue environments. Great tools! + 0 Votes In addition to reading a few books, forums and other online resources, wizard57m-cnet Moderator 1 year ago I would also recommend using a Linux Live CD or USB thumbdrive. I use Slax on USB quite a bit, even though Slax is getting a bit old now, not updated since 2009, it still makes a handy rescue device. Running a Live CD or USB version allows you to learn a few things, get your feet wet, without doing any modifications to the installed system on the PC. Other distributions have Live versions as well, I've been reading up on Salix OS as a possible refresh distribution on my USB thumbdrive.