A. Completely uninstall MTW2 & Kingdoms
B. Remove the Prefetch files for each program (Located in the Prefetch folder under C:\Windows\Prefetch) Each file should be associated with an .exe
C. Remove the programs from your registry (If you know how to do that)
To get to your registry: Start then Run and in the "Run" box type: regedit, which will bring up your registry. Look under Hkey_local_machine and find Software and CO7fty, under Software find the SEGA folder and delete MTW2 &/or Kingdoms if found there, under CO7fty find medieval2 and delete medieval2
D. Reinstall MTW2 with patches 1.1 & 1.3 and then install Kingdoms, which should patch you to Version 1.5 automatically
E. When you install Stainless Steel YOU MUST install in into the C:\Program Files\Sega default folder, if you don't it won't work!!! Remember that!