Your computer is up to date when you've installed the latest updates for Windows and your programs. To check for Windows updates, follow these steps:
Open Windows Update by clicking the Start button , clicking All Programs, and then clicking Windows Update.
In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.
If any updates are found, click Install updates.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
To check for updates for other software programs and devices, go to the publisher's or manufacturer's website.
To see how to get updates for Windows and other Microsoft programs at the same time, including updates for Microsoft Office (Word, Outlook, Excel, PowerPoint, and more), go to the Microsoft Update website. If you're already using Microsoft Update, which works with Windows automatic updating, Windows Update in Control Panel will automatically open and display your update status.
Some programs, such as antivirus or spyware monitoring programs, provide a link to check for updates from within the program. Some software publishers also offer subscription services and can notify you when new updates are available. It's a good idea to check for updates for your security-related programs first, and then for the programs or devices you use most often.