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I have recently reverted to using Windows 2000 SP5.1 with KernelEx as my daily driver OS, and as such would like to provide some useful information and freeware for all WinWorld users.
The KernelEx tutorial on YouTube is good, with a couple of exceptions: particularly the recommendation of Update Rollup 1. Do not install it on multi-core/CPU/HT systems, for it will make these extra threads/cores/CPUs run extremely hot and/or unstable. Instead, you can kill two birds with one stone by installing the Unofficial Service Pack 5.1 (https://majorgeeks.com/files/details/microsoft_windows_2000_unofficial_sp.html), which will also install IE6 SP1. Then install the January 2016 root update, followed by KB2817183 as in the YT tutorial, then install KB951748, then you have fulfilled all prerequisites for a stable extended kernel!
From there you can use virtually any XP-compatible web browser (although the Application Compatibility Toolkit from the YT tutorial may be necessary to trick installers). I recommend New Moon (based on Pale Moon) 28.0.0b5, which is very stable on win2k (28.2.0a1 produced occasional crashes on my end), available here: rtfreesoft.blogspot.com/2018/08/weekly-browser-binaries-20180811.html. I recommend at least 768 MB RAM if not 1 GB for modern win2k web browsing, and a dual-core processor for good results on YouTube (480p is perfect on Yonah T2400 1.83 GHz whilst my Core 2 Duo E6700 2.66 GHz can do 1080p well).
While I'm at it, here is some very hard-to-find but useful free software/supplements for Windows 2000 SP4+. First off, this is the first stable release of the Office 2007 Compatibility Pack for 2000/2003 (and unofficially 97). It was deleted from Microsoft's website although they kept a beta version up (how responsible): https://mega.nz/#!h1ElHKhR!6ruau-WYsP3vXK0mFQaXxJRVDU6Iww1P3ZmHVUVw4iE. Later versions dropped Windows 2000 support.
A universal wireless LAN client that supports WPA2 on Win2k SP4 and later. It does take two or three attempts to connect to my home network sometimes but the connection sound makes up for it:
And finally, some modern (2013) partition management freeware (a paid version also exists): AOMEI Partition Assist Home Edition 5.1.2, which works with Windows 2000 SP4+. It can do resizing and some more complex operations than the Windows Disk Management tool. I haven't tested it as thoroughly as the other software and I do recommend testing it in a VM before applying to metal, but I haven't had any issues either: https://mega.nz/#!MpE1BAxC!Wr-O1End_b_Gqmwzwr0OunYl9kJd1HrpzJgp5OfpasI
I do advise that mission-critical and sensitive tasks such as financial transactions be left to newer operating systems which may provide better security. I am not responsible for any harm resulting from using these tips.