A user is experiencing slower than normal performance on a computer running Windows XP Professional. The user has rebooted the computer several times, is on a closed network with no Internet access and all accounts are created as limited user accounts. Which of the following actions should be recommended to the user?

A.
Reboot the computer again.

B.
Reinstall the operating system.

C.
Run SCANDISK and CHKDSK utilities.

D.
Run the Disk Cleanup utility.