You can rest assured its harmless, and you don't need to remove it - if you change the Sata as AHCI, to Sata as IDE in the bios it wont show up, but Windows 7 may not boot and you will just have to change it back unless you reinstall the OS - is this worth the trouble to remove a useful tool even if you dont use it? Having it installed adds value to your PC also when you sell it.
It will probably improve the performance of your older drive also - with the newer drives they have it built into them.