今天突然發現在C盤根目錄下藏著幾個奇怪的文件：arcldr.exe、arcsetup.exe和NTDETECT.COM。這幾個文件都是隱藏的系統文件，也不知道從哪里來的，用瑞星查了一下沒有報是病毒，網上查了一下沒人說出個所以然來，最后還是一段英文說明了問題：

Verify Windows 2000 system files (Windows2000的系統驗證檔案)
This stage checks each of the core system file in Win 2000 against a set of checksums and make sure they're valid. This includes NTLDR, NTDETECT.COM, ARCSETUP.EXE, and ARCLDR.EXE files, all of which are used during the boot process. If any of these files are damaged, they get replaced with fresh copies from either the Win 2000 CD-ROM or the OEM disk that you got supplied with your computer.

所以說，這幾個文件都沒啥問題，不是病毒。