File size
1KB (kilobyte) = 1000 bytes
1MB (megabyte) = 1000 KB (1,000,000 bytes) (1 million bytes)
1GB (gigabyte) = 1000 MB (1,000,000,000 bytes) (1 billion bytes)
1TB (terabyte) = 1000 GB (1,000,000,000,000 bytes) (1 trillion bytes)

1 floppy holds 1.44 MB
1 CD holds 700 MB (80 minutes)
1 DVD holds 4.38 GB
1 CD holds as much as 486 floppies
1 DVD holds as much as 6.25 CDs
It would take 228 DVDs to hold 1TB

USB
USB 3.0 is coming soon. USB 3.0 can theoretically handle up to 5Gbps, while USB 2.0 peaks at a theoretical 480Mbps.

iPod
An iPod is a small portable device which is used to listen to music and Podcasts. Normally earphones are used, but the iPod can also be plugged into a stereo system, boom box, car radio, amplified speakers or other devices that have a input jack. Podcasts can be downloaded from the Internet and transferred to the iPod. The iPod uses a program called iTunes to transfer these files.
A podcast is usually a MP3 audio file. There are many free podcasts available for downloading from the Internet. You can do a search for "podcast" and find more than you can listen to. Here is one site NPR Radio

Programs & Icons
A program can be just one file, but is usually a set of files. The main file is called an "executable" (ends with exe, such as program.exe) file and if you double click it, the program will open.
An icon is a link to a program. You can have several icons for the same program. An icon is not the program, but only a link to it so when a icon is deleted, it doesn't delete the program.

COMMAND or CMD- to get to a DOS prompt
COMPMGMT.MSC - Computer Management
DEVMGMT.MSC - Device Manager
DXDIAG - DirectX diagnostic tool
IPCONFIG - (run from DOS PROMPT) to see the IP address
MSCONFIG - to configure Windows
NTMSMGR.MSC - Removable Storage Manager
PERFMON.MSC - Performance Monitor
REGEDIT - to edit the registry (for advanced users only)
TASKMGR - Task Manager
SERVICES.MSC - to see and change the status of services
WINMSD - System Information

To see all programs and processes that are currently running: press CTRL + ALT + DELETE or Right-click an empty area of the taskbar and then click Task Manager.

To see "System Properties", right click on the "My Computer" icon and choose "Properties". Here you will find various information including the speed of your computer and the amount of RAM and much more.

To show the version of Windows you are using on your Desktop, download a program called "Tweak UI" from the Microsoft site. Open the program and click on the "General" tab and check "Show Windows version on desktop".

Windows XP System Requirements

Minimum:
233 MHz CPU *
64 MB of RAM (may limit performance and some features) *
1.5 GB of available hard disk space *
Super VGA (800 x 600) or higher-resolution video adapter and monitor
CD-ROM or DVD drive
Keyboard and Microsoft Mouse or compatible pointing device

Maximum:
1 Physical CPU (Multi-Core + Hyper-threading supported)
4 GB of RAM
4 GB of Virtual Memory

4 GB FAT16 Partition
32 GB FAT32 Partition (Formatted during Setup)
2 TB FAT32 Partition
2 TB NTFS Partition (Basic Volume)

2 GB FAT16 File Size
4 GB FAT32 File Size
2 TB NTFS File Size (Basic Volume)

* > 137 GB Hard Disks require SP1 or higher (48-bit LBA-compatible BIOS Required)

Recommended:
300 MHz CPU *
128 MB of RAM *
1.5 GB of available hard disk space *
Super VGA (800 x 600) or higher-resolution video adapter with at least 8 MB of video RAM and monitor
CD-ROM or DVD drive
Network adapter
Sound card and speakers
Keyboard and Microsoft Mouse or compatible pointing device

* Actual requirements will vary based on your system configuration and the applications and features you choose to install. Additional available hard disk space may be required if you are installing over a network.

1 GHz processor (32- or 64-bit)
1GB of main memory
16GB of available disk space
Support for DX9 graphics with 128MB of memory (for the Aero interface)
A DVD-R/W drive