Booting your computer from an external drive is a useful tool for troubleshooting major performance issues. It allows you to access your internal hard drive from an external source. This used to be done by floppy boot disks. A faster way to boot your system externally is by creating a bootable flash drive. This requires that you re-format your flash drive in Microsoft's Command Prompt application. The good news is that this is not a difficult procedure.
Insert a blank USB flash drive
into an available USB port on your computer. Turn on your computer.
Click on the "Start" button in the bottom left corner of the screen. Click on "All Programs," and then click on "Accessories." Right click on "Command Prompt," then select"Run as Administrator" to launch the application with full administrative privileges.
Type "DISKPART" followed by the Enter key in the Command Prompt window. Type "List Disk" and press the Enter key again. Command Prompt will then list all storage drives installed on your computer. Each drive will be labeled Disk 0, Disk 1 and so on. Your main internal hard drive
will be Disk 0. Any secondary disk will be labeled DIsk 1.
Determine your flash drive's disk number. For example, if your flash drive is the only other storage device connected to your computer other than your internal hard drive, type "Select Disk 1" followed by the Enter key.
Type in each of the following commands followed by the Enter key:
CREATE PARTITION PRIMARY
SELECT PARTITION 1
Minimize the Command Prompt window for later use.
Insert your Windows installation DVD into your computer's optical drive. Maximize the Command Prompt window, and then type "D:CD BOOT" followed by the Enter key. Type "BOOTSECT.EXE/NT60 H:" and hit the "Enter" key to proceed.
Type "xcopy d:\*.* /s/e/f e:\" to copy the entire Windows installation DVD to your flash drive. It may take several minutes for the DVD to copy.