you need to move your database on the new computer if you are just playing LAN. or if not, make your computer accessible publicly, just like you're playing on the official servers.
where did you download the Ragexe? Also, are you encountering any errors?
hmmm here http://www.nickyzai.com/?p=kro 2013-12-01 , i dont know what diff file version will i use to my rag.exe