"The Adobe Flash Player 10.2 no longer supports Microsoft Windows 2000" Both the IE and non-IE version install fine, but throw an exception at the end. Both IE6 and Firefox Nightly use 10.2 properly. No modifications required. Flash Player 10.3 (ActiveX and plugin versions) both work perfectly fine on 2000. CS:Source (non-steam) works fine on 2000 L4D2 (non-steam) works with the following modifications: - EZ install kernel32.dll and advapi32.dll from BlackWingCat's KDW wrapper - Import a PSAPI.dll from an XP (I used XP SP3) install and put it in the folder - http://img836.images...73/10830056.png Firefox 4.0 Nightly works properly (Even on 2000 RTM). Incompatibilities: - TrueTransparency and tabs in titlebar mode (obviously), but also leaves artifacts when the menubar is hidden. - SmoothText and hooking the Window Captions causes the window to blank repeatedly. EDIT (Apr. 14, 2011): Firefox 6.0a1 still works. EDIT (Aug. 07, 2011): FF 8 Nightly still works, as well as Flash Player 11. O&O CleverCache 7 works; run Setup and grab the extracted files from %temp%, drop LaunchConditions table from the MSI using Orca. Install with setup.exe, and drop in an XP PSAPI.dll into the installed folder. Seems to work. O&O Defrag 14 works with the same Drop Table modification. No additional DLLs are needed. EDIT: (Aug. 24, 2011): FF 9 still works. foobar 1.1.7 works with some KDW dlls and gdiplus. AltDrag (great tool) works with some KDW dlls and dbghelp.dll from XP.