Dear all, Thought my explanations were clear, i will then try to be more precise. 1) Obviously I have Kernelex final installed 2) I have made a manual modification of the registry launching the regedit program via Start\Run (don't forget that I have a french Win 98SE and that I'm not familiar with the english names of commands) 3) Once the registry was open, I went tho the key "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion" 4) I left clicked on that key to select it and at the same time to display on the right pane of the registry the strings associated to that key 5) I had only one which was "default" 6) still the key mentioned at point 3 selected, i have done right click, hitting "add new string value" command 7) then a new string appeared on the right pane with invitation to give a name - I have called that new string CurrentVersion 8) then I have double clicked on this newly created string (on the right pane) and entered 5.1 in the corresponding window 9) Then I have closed the registry, rebooted the PC and run Flash 10 install with success Hope this helps - This is the usual procedure to make manuel changes to the registry