Scan disk-boot time scan not working

Hi,



I cannot schedule boot time scan with my scan disk.

I am keep getting a message at every boot even thought I scheduled
once.Error message : Cannot open volume for direct access.

I understand some security softwaremay interfere with the performance of the
scan disk such as antivirus if it is enabled load at system startup.

I disabled all my security software and tried but still having problems.

Any suggestions? Thanks in advance and please suggest me something that will
really work

Thank you.