NTFS is standard
Windows 2000 will automatically use the FAT32 file system
Fat 32
Windows 2000
NTFS
Windows 2000 supports FAT16, FAT32, and NTFS partitions.
NTFS5
Windows 2000
Ntoskrnl.exe
A Windows virus scan is not performed automatically if one does not configure it to scan a Windows computer automatically. An antivirus is protecting you automatically from opening a infected file.
Windows 2000 supports three primary file systems: FAT32 (File Allocation Table 32), NTFS (New Technology File System), and CDFS (Compact Disc File System). FAT32 is commonly used for compatibility with older systems and devices, while NTFS offers advanced features like security permissions, compression, and large volume support. CDFS is used for reading data from CD-ROMs. NTFS is the preferred file system for Windows 2000 due to its robustness and features.
CDFS CD Rom File System is relatively simple format defined as the read only formatting standards for cdrom media.
NTLDR is indeed a key boot file in Windows 2000 and all of the Windows operating systems since Windows NT. A machine will not boot without that file.