Interesting topic! I carried out my own tests, preparing four installation CDs with the following NTDETECT and NTLDR files- with stock W2000 SP4 files, with XP SP3 files, with Server 2003 files and with Server 2003 SP2 files. Basic specs of test PC- Asus A8V-X MB, single-core Athlon 64 3800+ CPU, nVidia 7600GS vid card, old 10 GB Quantum Fireball Plus HDD, 4 GB DDR-400 RAM (curiously, system only sees 2.9 GB, even with x64 OS- still haven't solved this one). The HDD was wiped with DBAN before installing the OS, which was then updated with MB and vid drivers plus all W2000 updates. After every test the HDD was wiped before installing the next setup to minimize the chances of software remains from previous install influencing results. Each install was started 5 times and boot time measured. Boot times from start boot to appearance of login window were as follows- With stock W2000 SP4 NTDETECT and NTLDR files time required was 48 seconds. With XP SP3 NTDETECT and NTLDR files time required was 46 seconds. With stock Server 2003 NT DETECT and NTLDR files time required was 44 seconds. With Server 2003 SP2 NTDETECT and NTLDR files time required was 48 seconds (which suggests that Server 2003 SP2 installations MIGHT benefit by reverting to the original Server 2003 files!!! This is progress????). While a crude test it does suggest that the Server 2003 files are the best replacement for the stock W2000 SP4 files. A different PC spec may give different results, though. And while not a spectacular improvement, 4 seconds are not to be sneezed at.