chkdsk failure primary partition (access denied)

Hi I noticed this problem when I tried to delete something off the drive, then I tried to run an antivirus scan and it gave me an error if incapacity to delete viruses due to a dirty disk and that I should run chkdsk. So I right clock on the drive and attempt check now. It tells me that it must first dismount the drive before it can do so and asks if I would like to force a dismount. To...