How to install Windows 7 Service Pack 1 (SP1)

The quickest way to get Service Pack1 is to turn on “automatic updating” in Windows Update in Control Panel, and wait for Windows 7 to notify you that SP1 is ready to install. It takes about 30 minutes to install, and you’ll need to restart your computer about halfway through the installation.

To know if Windows 7 SP1 is already installed

Click the Start button , right-click Computer, and then click Properties.

If Service Pack 1 is listed under Windows edition, SP1 is already installed on your computer.


Disk space requirements

Make sure you have enough free disk space to install SP1

Installation method Estimated amount of free disk space required
Windows Update
  • x86-based (32-bit): 750 MB
  • x64-based (64-bit): 1050 MB
Downloading SP1 from the Microsoft website
  • x86-based (32-bit): 4100 MB
  • x64-based (64-bit): 7400 MB
Installing SP1 using an installation DVD
  • x86-based (32-bit): 4100 MB
  • x64-based (64-bit): 7400 MB