Yes, there is nothing wrong in trying to find out what is wrong, but again, you have to have some amount of knowledge as to what you are doing. If not, you might cause more harm, apart from wasting time and energy. In such cases, it's better to ask for help.
Just a few days ago, I came across a thread on another forum, where the guy said that since he couldn't uninstall a software, he just deleted all the files that he could find on the computer for that software, and even ran registry cleaner. That was obviously the wrong thing to do. He then even posted about this in the forum, in case it helped someone else.
All he had to do was quit the software from the system tray, and the software would have uninstalled just fine, and he wouldnt have to risk his PC running registry cleaner, and deleting files which is a wrong way to remove a software. If he had posted about the issue beforehand, he would have got the solution, which was really very simple.
Have seen many other cases too.
And yes, it's the same about computer shops everywhere. Here too it's the same. It's the same in other fields too. They just want money.