arcldr.exe和arcsetup.exe是病毒吗？

今天突然发现在C盘根目录下藏着几个奇怪的文件：arcldr.exe、arcsetup.exe和NTDETECT.COM。这几个文件都是隐藏的系统文件，也不知道从哪里来的，用瑞星查了一下没有报是病毒，网上查了一下没人说出个所以然来，最后还是一段英文说明了问题：

Verify Windows 2000 system files (Windows2000的系统验证档案)
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.

所以说，这几个文件都没啥问题，不是病毒。