i had also had the same problem your facing, i installed KSRo on separate folder but it wiped out ISRO on C drive . what u need to do is...
- Install KSro on a different Drive( eg D,E ).
- Then copy it and paste it on C also make a folder naming it, Ksro and The subfolder "KSRO Program" rename it to "Ksilkroad".
- Uninstall Ksro from "D,E" drive.
- Then install ISRO on C drive
- you are Good to go
Hope this helps , this was what i did i got Ksro and ISro on my C drive hehe
have Fun !
ps
If u want to play Ksro just go to the folder and click on "Silkroad online Launcher" u can Cr eat a Desktop shortcut