A month or so ago my computer suddenly began to lag. I only notice it really when burning dvd's. I used to be able to burn a dvd while using winamp, but now the music will stutter. Even without music, the burning process is much slower. I have searched for spyware and I have defragged.
Either run a diagnostic check on the hardware, or enter this on google; CoolWeb Remover. Download it and run it. If none of these fix the problem, throw it away and buy an XBOX 360....... .....for me