Kelly, the following is from the Windows Help file on my Windows 7 machine. Hope this helps.
If you don’t want updates to be installed automatically, you can choose to be notified when updates apply to your computer instead. Then, you can download and install them yourself, or you can set Windows to automatically download updates, and then notify you so you can install them yourself. Here’s how to change how Windows installs or notifies you about updates:
Click to open Windows Update (Start – Control Panel – Windows Update).
In the left pane, click Change settings.
Under Important updates, click one of the following:
Install updates automatically (recommended)
Download updates but let me choose whether to install them
Check for updates but let me choose whether to download and install them
Never check for updates (not recommended)