Certainly treat a re-install as a last resort, even if you are experienced and have planned well, it is a pain waiting for all the updates that have occurred since your system was created and re-installing all your applications.
If you do re-install, consider making an image backup as soon as you have updated and installed your basic applications. This will enable you to return to that clean basic installation very quickly at any time.
If you have an old PC, I would encourage anyone to have a go at installing a virgin operating system. Provide you have created your system discs as you were advised to do (you did do that ?) , it is a straight forward process.
Simply take your time, read the screens that come up and follow the text. If unsure about the choices offered, you won't go far wrong by accepting the defaults, Depending on your system it can take an hour or two, but is easy enough, nothing to be frightened of.
Having a nice clean virgin operating system is a lovely feeling, like re-decorating the whole house.