Looks like something is still blocking the HWiNFO driver, could be some remain from the old version or some other tool.
Do you maybe have some other monitoring tools running, i.e. ThermalTake ?
Make sure HWiNFO is not running and try to delete this file (it will require an UAC prompt): C:\Windows\system32\drivers\HWiNFO64A.SYS
Then try again to reboot the machine.