I'm confused.
The second pic shows TC installed.
The first pic appears to be the CD drive, why are you running Trainz.exe in there?
If you re-boot your PC and then put the Disk into the DVD drive it should give you some options to install or un-install depending on what it thinks the situation is.
If you think it is messed up then un-install.
If it doesn't want to cooperate delete the trainz classics folder it installed and clear out the registry. Re-boot and then run a clean install.
Do you have TC1&2 installed?
Mike.