The "Disk" rating for the system is poor and may be the cause of performance problems. Reducing the number of open applications ...

The "Disk" rating for the system is poor and may be the cause of performance problems. Reducing the number of open applications may improve system performance. Ensure the disk has adequate free space and is defragmented. Check for unnecessary startup applications and disable those that are not required. If the problem continues the disk may need to be upgraded.