Running XP and had a couple blue screen errors. Prior recommendation from windows support to run CHKDSK /F. try to run it, message says it has to run upon restart. restart system and get error saying cant run CHKDSK /F because the volume is NTFS?? If I try to simply defrag, I get message that it cant because chkdsk is scheduled to run…search scheduler & can’t find where to delete scheduled chkdsk /F, so I can at least try to defrag my system…spinning my wheels here…advice in simple language please?