You can't put the Raildriver in a folder, it's too big to fit. :hehe: Seriously, if you're asking how to install it, download http://raildriver.com/download/td/rdts2009.exe and double click (or right click and "run as administrator" of Vista / Windows 7) on that file, point it to the new installation of TS2010.
Just occurred to me, if you're asking how to find the folder you just installed TS2010 into so you can point the RD installer to it, select the shortcut for the new TS2010 and right click, select Properties from the new menu that opens, and look at the "target" in the properties window;