Hp computer taking along time to start up amd running slower than it use to

If its an HP and taking along time to boot up I would run a chkdsk on the system if it takes longer then 45 seconds to finish then you most likely have an overheating disk that is on its way out. This can be done by going to start -> run type in CMD press ok then in the black command prompt window type chkdsk and hit enter. other factors that can cause the system to run slow again with age is that the processor may need to be reseated applying some new thermal grease.

If this is a fairly new system then you may want to look at all the applications that are starting with the system could have spyware or something else running that doesn't need to be.