Are you running on an intel-based motherboard and using the on-board chipset raid functions?
if YES and you need to manage your raid sets from windows, you need the intel rapid stor to manage the raid sets.
if YES and you do NOT need to manage your raid sets from windows, you can kill it off. This will restrict you to managing your raid sets from the BIOS (pre boot) environment ONLY.
if you are NOT using raid on an intel chipset, you can kill off the rapid stor software.
If all you want/need are the latest intel drivers for disk/ACHI, they can be separated from the RapidStor install program pretty easily. Use something like 7Zip to open up the RapidStor installer, browse around until you find the driver.cab, extract that to a temp directory, then using 7Zip again, pull the drivers out of the cab itself. Now install the drivers in the usual windows way via Device Manager.
Also, you should check to make sure that your chipset INFs are up to date. Intel releases updates to its chipset software from time to time. It does no harm to reinstall the chipset drivers, the installer is smart enough to ID your machines chipset and update things.
Intel has a online java-based driver checker that will advise you of any updates for your in-board Intel devices.
http://www.intel.com/p/en_US/support/detect/Intel doesn't have persistent web links for the latest driver versions. They have you jump through hoops, identifying your mobo product then they tell you what drivers are suitable.
This link will get you started
https://downloadcenter.intel.com/Default.aspxI usually pick out a mobo with the latest Intel chipset and grab the drivers for that.