You're welcome. Glad I could help. There may sometimes be options that will change when you clear a CMOS. For instance, resetting the time in BIOS so Windows matches up again (it won't let you run Windows Update without a fairly correct BIOS time) - although modern UEFIs will save some settings (unless you update your "bios" then even this will likely be cleared - but not always). However, one key thing for some motherboards is that the SATA ports would be reset from AHCI back to IDE or vice versa - which may break your operating system. The trick is to boot using the alternative mode. If you are in IDE mode and would like to switch over to AHCI (which is preferable) you can, by changing a registry key within Windows and then changing the setting in the BIOS before you reboot.