If you have or have had a network of more than one computer, it can be useful for sharing files between computers by mapping a network drive. Network Drive Mapping allows a computer to read and write files on the hard drive to another as if they were connected directly together. The problem with network drives is that Windows XP tries to connect to the network drive when it starts. If the remote computer does not respond immediately, Windows XP is expected, delaying the start time. In addition, some programs try to connect to the network drive to find files and folders. If you tried to open a file and had to wait several seconds, probably because the program is to establish a network connection, even if you open the file on your local computer.
Step 1 : Start >>My Computer
Step 2 : Tools menu >> click Disconnect Network Drive.
Step 3 : Chose network drives that you no longer need >> click OK