C盘每天都要自检一次，都是正常关机的，怎么回事？

RT，每天开机都有自检一次，我检查过硬盘了，没有坏道，没有坏的扇区，
也在安全模式下杀毒了，分别用小红伞和小A杀过，最后一键还原了，但是还是每天开机的第一次自检，orz 我要疯了，请电脑高手指点一下，好的话，我会加分的，拜托了，附上开机自检时的诊断，
Checking file system on C:
The type of the file system is NTFS.

One of your disks needs to be checked for consistency. You
may cancel the disk check, but it is strongly recommended
that you continue.
Windows will now check the disk.
Cleaning up minor inconsistencies on the drive.
Cleaning up 1215 unused index entries from index $SII of file 0x9.
Cleaning up 1215 unused index entries from index $SDH of file 0x9.
Cleaning up 1215 unused security descriptors.
CHKDSK discovered free space marked as allocated in the
master file table (MFT) bitmap.
Windows has made corrections to the file system.

15366140 KB total disk space.
3375108 KB in 7550 files.
2588 KB in 1143 indexes.
0 KB in bad sectors.
47068 KB in use b