我的电脑有时启动到瑞星的蓝屏界面结束后和欢迎界面出来前会死机，这时硬盘等不亮，显示器处于待机状态，有时又能正常启动，尝试过重装系统也未能解决，请问这是什么原因？

这是磁盘扫面的日志文件，能帮我分析下么？

Checking file system on C:
The type of the file system is NTFS.

A disk check has been scheduled.
Windows will now check the disk.                       
Cleaning up minor inconsistencies on the drive.
Cleaning up 100 unused index entries from index $SII of file 0x9.
Cleaning up 100 unused index entries from index $SDH of file 0x9.
Cleaning up 100 unused security descriptors.
CHKDSK is verifying Usn Journal...
Usn Journal verification completed.
CHKDSK is verifying file data (stage 4 of 5)...
File data verification completed.
CHKDSK is verifying free space (stage 5 of 5)...
Free space verification is complete.
CHKDSK discovered free space marked as allocated in the
master file table (MFT) bitmap.
Windows has made corrections to the file system.

  20482843 KB total disk space.
  14875064 KB in 54112 files.
    17244 KB in 6616 indexes.
        0 KB in bad sectors.
    231491 KB in use by the system.
    65536 KB occupied by the log file.
  5359044 KB available on disk.

      4096 bytes in each allocation unit.
  5120710 total allocation units on disk.
  1339761 allocation units available on disk.

Internal Info:
50 f2 00 00 44 ed 00 00 44 43 01 00 00 00 00 00  P...D...DC......
a4 00 00 00 01 00 00 00 f8 02 00 00 00 00 00 00  ................
52 67 97 04 00 00 00 00 94 b9 4e 18 00 00 00 00  Rg........N.....
ac f6 ca 05 00 00 00 00 ce 5a cc 04 01 00 00 00  .........Z......
8a 2a 6d 2e 00 00 00 00 d8 23 81 63 01 00 00 00  .*m......#.c....
99 9e 36 00 00 00 00 00 d8 3c 07 00 60 d3 00 00  ..6......<..`...
00 00 00 00 00 e0 e6 8b 03 00 00 00 d8 19 00 00  ................

Windows has finished checking your disk.
Please wait while your computer restarts.

1看看硬盘有没有坏道？IDE在DOS下用效率源，SATA在WIN下用HDTUNE
2硬件不兼容，
升级主板BIOS
安装最新的主板驱动
用MemTest检测内存
换一下显卡

楼主重做系统没有改善的话多半是硬件问题

另外御载瑞星试试