Let's say that it's slow and you have nothing on said PC. Why not restore it to the factory condition and it should work just as good as new?
If you want to research a program there are two common ways.
1. You use that program. Good. It's not one to remove.
2. Your OS uses that program. Good, it's not one to remove.
Item 2 may take research. Many use google.
My computer is really slow and I'd like to delete as many of the programs on it as possible without causing any damage. There are 159 in total.
Unfortunately, I don't know which ones I could safely delete. Any advice would be appreciated.