Viruses, spyware and adware can slow your computer down. They also can track what you do online and steal your password and other information. Some real sounding software is actually spyware. Sometimes spyware can get on your computer when you download and install legitimate programs and they ask to install something like a toolbar which contains the spyware.
If you computer is getting slower and slower, becoming less responsive and getting harder to use, let us check it for viruses and spyware. You may not need a new computer. Sometimes getting the spyware and viruses off makes them act like new. Cleaning off computer viruses and spyware makes your computer and you happy.