trim is enabled if you are running windows 7. you must install windows 7 with the drive in AHCI mode, you can't change it to AHCI after you installed it in IDE mode without running a fix. theres instructions somewhere on Microsofts site, Google it. or just reinstall correctly since its a new setup.
there are plenty of windows based drive erasers... again. Google. why you'd think you need to wipe it I don't wanna know