Changing the jumper settings simply involves removing the small plastic and metal connector from 2 pins and moving it to another position covering 2 other pins. Even if you went there and downloaded all the new software, you may still encounter some kind of problem. For example, your new DVD drive may be playing movies just fine but without sound. A certain game that used to work fine may not like your new video card. You'll probably find the solution to your problem at the manufacturer's Web site.
Web sites are difficult to navigate.
Some Web sites have a search feature, so you can search for your problem and get the answer pretty easily. Sometimes the exact solution to your problem will appear. OK, no problem. The best newsgroup for help is called 24hoursupport.helpdesk. You can post a question there, and most likely someone will give you the answer you need within a few hours.