Multiple Remote Desktop Connection Windows XP

STEP 1
Start your Windows in Safe Mode (tap on F8 first of the Windows Loading Splash Screen);
click on “My Computer” with right mouse button and choose “Properties”;
go to “Remote” tab and uncheck “Allow users to connect remotely to this computer” (if it’s already unchecked, just do nothing);
click OK.
 
STEP 2
Go to Start -> Control Panel;
open “Administrative Tools” and then “Services”;
double click “Terminal Services”, in the list;
choose “Disabled” for “Startup Type” option;
click OK.
 
STEP 3
Go to C:\windows\system32\dllcache;
rename the termsrv.dll file to termsrv.original or another name you like;
copy into the folder this unrestricted old version of termsrv.dll;
go to C:\windows\system32 (the upper folder of the current one);
do the same operation: rename termserv.dll also here, and put another copy of the file I linked above.
 
STEP 4
Click Start, then “Run…”, type “regedit” (without quotes) and press ENTER;
navigate in the Windows Registry Tree to reach this path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core;
click with right mouse button on blank space in the right part of the registry window, choose “New” > DWORD, name the new key “EnableConcurrentSessions” (without quotes), then edit it and set its value to 1;
close the editor.
 
STEP 5
Click Start, then “Run…”, type “gpedit.msc” (without quotes) and press ENTER;
open Computer Configuration > Administrative Templates > Windows Components > Terminal Services;
double click “Limit number of connections”, choose “Enabled” and set the maximum number of concurrent connections you want to allow (2 or more), then Restart Windows in normal mode.
 
STEP 6
Go back to Remote tab of My Computer’s properties (see step 1) and activate “Allow users to connect remotely to this computer”;
Go back to “Terminal services” in “Services” (see step 2) and set its “Startup type” to “Manual”