If your Windows XP computer does not appear in the Clientless Backup page, or is displayed as a grayed icon, perform the following steps to enable file sharing.
To enable file sharing in Windows XP
Click Start > Control Panel.
Open the Network Connections Control Panel applet.
Select the Local Area Connection.
View the properties for this connection by right-clicking on the icon and choosing Properties from the menu.
Make sure the File and Printer Sharing for Microsoft Windows check box is selected.
Click OK.
If you are still having trouble, make sure Windows Firewall is not blocking File and Printer Sharing. Do the following:
Click Start > Control Panel.
Open the Windows Firewall Control Panel applet.
In the General tab, ensure that the Do not Allow Exceptions check box is not selected.
In the Exceptions tab, make sure the File and Printer Sharing check box is selected.