WMIC (Windows Management Interface Command) is a command line tool that returns information about the system where it's run. To open a command line shell, at the bottom of the screen, left side of the taskbar, in the Windows search text box, type cmd. To learn your computers model, vendor, and serial number, type the command shown below at the command prompt.
wmic csproduct get name,vendor,identifyingNumber

Perfoming an online search with the name and vendor information provided will return loads of information allowing you to find upgrade, troubleshoot, or repair your computer.
More Windows Administration Information:
• A Handful of Useful Run Commands: calc, notepad, wordpad, voice recorder, control
• Planning a Backup and Restoration of Files for Disaster Recovery
• The Windows 7 Backup and Restore Utility
• Installing a Network Printer on Windows XP and Vista
• Environment variables in PowerShell
• DOS Tasklist and Taskkill Commands
• Disable Indexing to Speed Up Your Computer
• Retrieving Information from Computers Belonging to an Active Directory OU
• Introduction to DOS
• CompTIA Security+ Made Easy
