I am the only user on this computer and I don't have an administrator set-up, anyhow, I went to the icon and made sure I am running as an administrator. No change. Then I am playing with changing KUID's, cloning, deleting DAT files, and any combination that would make sense. I will post the results. I think I will know more about this than before even if I can't solve the problem.
The Administrator account always exists even if you are logged in as the only user. This account is used when you go into Safe Mode for repairs, need to run system utilities, and run some software packages.
If there's no change in what's going on, then unfortunately it sounds like something got trashed. When you upgraded to W7, did you do a fresh install, or an "in place" upgrade?
The fresh install but keeep your existing drive format method will move your data to a special folder called Windows.old.
After this you must reinstall all your applications, and then move your data to the appropriate folders (libraries) such as Documents, Pictures, etc. Their equivelents are My Documents, My Pictures, etc. under XP. Your program data such as your Local folder, I think, will still exist as well.
The other and not recommended upgrade, is the in-place upgrade. This is where the OS is replaced, file-by-file, but all your programs remain. To be honest, I have never had good results with this method. I have always had poor program performance, lost settings, etc., and usually ended up reinstalling all the applications anyway.
Keep poking around, and let us know what you find. You do have a backup of your Local folder I hope?
It's too bad we all don't have some kind of remote access software installed on our PCs. We could troubleshoot the Trainz settings and other computer problems for each other.
John