Remotely enable Remote desktop

I found some times we need to access the computers remotely but its disabled.

source from : http://oreilly.com/windows/archive/server-hacks-remote-desktop.html

Fortunately, there's a workaround. Sit down at your desk and log on to your Windows XP workstation using your administrator credentials and start Registry Editor by Start --> Run --> regedit --> OK. Then select the Connect Network Registry option under the File menu (Figure 2).

Figure 2. Connecting to the Registry on a remote machine.

This opens the Select Computer search box. Either browse Active Directory to locate the remote server, or type its name in the textbox (Figure 3).

Figure 3. Connecting to the Registry on a remote server named SRV220.

Click OK and a node will be displayed in Registry Editor for the remote machine (Figure 4).

Figure 4. HKLM and HKU hives on SRV220.

Now browse HKLM on SRV to find the following Registry key (Figure 5).

HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server

Figure 5. Registry key for Terminal Server on remote machine.

Under the Terminal Server key, you'll find a REG_DWORD value named fDenyTSConnection. Double-click on that value to open the Edit DWORD Value box and change the value data from 1 (Remote Desktop disabled) to 0 (Remote Desktop enabled), as in Figure 6 below.