Disable/Enable your network card from the command line.

Save these commands as a .cmd file:

@ECHO OFF
CLS
ECHO Disabling network interfaces.
netsh interface set interface "Local Area Connection" DISABLE
netsh interface set interface "Wireless Network Connection" DISABLE
ECHO Enabling network interfaces
netsh interface set interface "Local Area Connection" ENABLE
netsh interface set interface "Wireless Network Connection" ENABLE
PAUSE

*This has only been tested with Windows 7

Default Gateway Ping Test Batch File

This is a batch file that will let you test your connection status by pinging your default gateway.  Copy this code into notepad and save the file with a .BAT or .CMD extension.

@ECHO OFF
COLOR 1F
TITLE GATEWAY PING TEST
:PINGTEST
CLS
FOR /F "TOKENS=2 DELIMS=:" %%G IN ('IPCONFIG ^| find "Default Gateway"') DO (
    IF NOT "%%G"==" " (
        PING -w 30000 -n 1 %%G
        IF ERRORLEVEL 1 ECHO UNABLE TO PING GATEWAY!!!
    )
)
ECHO.
CHOICE /T 5 /D Y /M "WAITING 5 SECONDS BEFORE RETRY"
GOTO PINGTEST

*This has only been tested with Windows 7.  YMMV

Erasing or Wiping a Floppy Disk

Apparently there is a new switch to the format command that will let wipe a disk with multiple passes of writing 0 to the sector. For example:

format A: /P:3 /V:

will erase disk A: writing 3 passes of zero on each sector. "/V:" is for blanking the volume label. The disk is still usable but the old data is not recoverable. (Checked with PC Inspector File Recovery) This works with Vista and higher.

Free Online Virus Scanners

This is where I'm keeping my list of free scanners.  I may even update this list on a semi-frequent basis.

1. ESET: http://www.eset.com/us/online-scanner/
2. Bitdefender: http://www.bitdefender.com/scanner/online/free.html 
3. Trend-Micro HouseCall: http://housecall.trendmicro.com/ 

Also, update your virus definitions and get a valid copy of antivirus software.  I've been using Microsoft Security Essentials and Clamwin with pretty good results.

1.  Microsoft Security Essentials: http://windows.microsoft.com/en-US/windows/products/security-essentials
2. Clamwin: http://www.clamwin.com/content/view/18/46/

This is not a virus scanner, but it will analyze unknown binaries or links.

• Anubis: Analyzing Unknown Binaries 

Setting or changing a computer description.

You can right-click "My Computer" and set the computer description:

You can also do it from the command line:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>net config server /srvcomment:"Brian Hart's Notebook"
The command completed successfully.

You can use the computer description to identify who owns a computer without infringing on the company naming policy.

If you are on a Windows 7 system and cannot see the description, create a folder named "Network.{208d2c60-3aea-1069-a2d7-08002b30309d}" (without the quotes).

More info: http://blog.chrisara.com.au/2009/08/restoring-computer-description-in.html

Quickly Add or Remove Programs.

If you want to quickly Add or Remove a program from windows you can type "appwiz.cpl" in your Win7 search box or your XP Start->Run box.

Remember it as the "Application Wizard in my Control Panel".

Why do we want to do this?  More on that later.

Protecting your external hard drive data.

Always put your your external hard drive on the floor.  Somewhere it won't get kicked or stepped on, like under the coffee table.  It's already as low as it can get so it can't get dropped and lose all your family pictures and Justin Beiber tunes.