Some antivirus software might prevent SP1 from installing or slow down the installation. You can temporarily disable your antivirus software before the installation. Follow the instructions to install the update. If any important updates are found, select the link to view available updates. Install any important updates and then follow these steps again to check for SP1.
Select Install updates. You might be asked for an admin password or to confirm your choice. After SP1 is installed, sign in to your PC.
You might see a notification indicating whether the update was successful. If you disabled your antivirus software before the installation, make sure you turn it back on. Go to the Windows 7 Service Pack 1 download page on the Microsoft website.
Select Install Instructions to see which packages are available for download, and make note of the one that you need.
Select the appropriate language from the drop-down list, and then select Download. Select the packages you need to install, select Next , and then follow the instructions to install SP1. Your PC might restart a few times during the installation. Select the link in the table that corresponds with the version of Windows running on your PC. On the Microsoft Download Center page, select your language and then select Download.
It might take a few minutes for the tool to download and install. To install the tool immediately, select Open or Run and then follow the instructions. To use the tool later, select Save and download the installation files to your PC. It'll walk you through installing some free software and then show how to use it to make the ISO. Next, we're going to work on properly getting that Windows 7 ISO you just created onto the flash drive. Once downloaded, execute the file and follow the installation wizard.
If you downloaded Windows 7 directly from Microsoft, check for the ISO image wherever you tend to store downloaded files.
Click Next once you're back on the Step 1 of 4 screen. On the Step 3 of 4: Insert USB device screen, choose the flash drive or external hard drive you want to put the Windows 7 installation files on. If you haven't yet plugged in the flash drive or other device you're using, you can do that now.
Just click the refresh button to make it show up in the list. Click the Begin copying button. Then click Yes to the confirmation in the next window. If you don't see this it just means that the flash drive or external hard disk you've selected is already empty. You'll see a Status of Formatting for several seconds, followed by Copying files. This part might take as long as 30 minutes, maybe even longer, depending on which edition of Windows 7 the ISO file you have is from, as well as on how fast your computer, USB drive, and USB connection is.
The percentage complete indicator may sit on one or more percentages for a long time. This apparent pause doesn't mean anything is wrong. The USB drive can now be used to install Windows 7.
Boot from the USB device to start the Windows 7 setup process. If you still can't get the flash drive to boot, and you also have a UEFI based computer, see the information at the bottom of this page.
If you arrived here from How to Clean Install Windows 7 , you can now return to that tutorial and continue installing Windows 7. You should have now installed Windows 7 by USB. To get the USB drive to boot on these computers, you should copy the data from the flash drive onto a folder on your computer, then reformat the flash drive using the older FAT32 file system, and then copy that same data back onto the drive.
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