You will have your MAC for years, and liekly without much of the issues a PC will have.
By definition Mac/Apples are PC's. PC stands for Personal Computer, which encompasses any computer that is of a personal nature. This is a common misnomer perpetuated by those Mac vs PC commercials. Technically you aren't having issues with any PC, you are having issues with the OS; in this case it was probably an older version of Windows. Windows 7 is leaps and bound better than any previous edition; I was skeptical at first, but it is amazing...even my mom who is notorious for "accidentally" installing spyware/viruses hasn't gotten any because of the new security features.