Huge performance gains can be realized by optimizing or defragmenting your disk drives in Windows 2000 and NT. Here are some links to third-part software/utilities that can help do that.
Contig
Single-file defragmenter that attempts to make files contiguous on disk, by Mark Russinovich.
Defrag Your Drives
Defragging should be a part of your regular system maintenance schedule, and can help improve performance.
Diskeeper
NTFS defragmenter - industry leader, by Executive Software. See review below.
Norton Speed Disk
Centrally managed disk defrag, by Symantec. See review below.
PageDefrag
Defragment the Windows NT paging file to improve system performance, by Mark Russinovich.
Perfect Disk 2000 Best of the Net
"The ultimate defragger for all Windows environments," by Raxco Software.
Review of Diskeeper 5.0 Server
Dextrous Defragger, review by Jim Norris in Windows NT Systems Magazine, January 2000.
Review of Norton Speed Disk 5.0
Antidote for Disk Distress, review by Jim Norris in Windows NT Systems Magazine, January 2000.
StartDefrag
This program facilitates scheduling of hard drive defragmentation on the Windows 2000 operating system. Scheduling is not supported by the standard defrag software included with the OS, from Kevin Gearhart.