How to disable Administrative shares on Windows XP

1. Open Registry Editor (Start - Run - type "regedit" and press OK button)
2. Navigate to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanManServer\Parameters"
3. Right click on "AutoShareWks" and change its value to "0"

How To Renaming the Administrator account in Windows XP

The Administrator account exists on all computers runningWindows XP Professional and Home. This gives potential hackers, half theinformation they need to access your computer—all they have to do is guess yourpassword.
You can make it more difficult for unauthorized persons toget into your system by renaming the Administrator account.

See Bandwidth Usage Per Process Via Terminal with Nethogs

NetHogs is a small 'net top' tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process.
NetHogs does not rely on a special kernel module to be loaded. If there's suddenly a lot of network traffic, you can fire up NetHogs and immediately see which PID is causing this. This makes it easy to indentify programs that have gone wild and are suddenly taking up your bandwidth.