He, I know the feeling, Well first off if you run Server_lite_12 then you should be able to run the original Shaiya, look for the Shaiya_Install_US_090210. Then you will need to by-pass the GG, but I suposed you know that already since it says login data error, intead off "cannot connect to server" so having said that, if your DB is the same as Lite_V12 and installed Shaiya090210 you should be able to run the EP3 game... but if you changed the database well thats a hole other story, cause thats the feeling i get, you cant connect to DB. If you want more help you could do this...
1. go to "SHAIYA_SERVER\SERVER\PSM_Client\Bin\Log" Delete all
2. Open Server Patch Config and do Start all"
3. Go back and read your Log and see if any errors are displayed in those files
4. Post errors here if there is some
When you connect to MSSQL do you connect using SQL Server Authentication or Windows Authentication.
P.S. You no longer need your firewall or UAC off, it was just for running the install.bat