Here are the tips for you how to update the service pack 2, come on, give it a try.
One way to update Windows 7 - To turn on automatic updates in Windows 7:
1.Select the Start button
2.In the search box, enter Update, and then, in the list of results, select Windows Update.
3.In the left pane, select Change settings, and then under Important updates, select Install updates automatically (recommended).
4.Under Recommended updates, select the Give me recommended updates the same way I receive important updates check box, and then select OK.
5.Reboot your computer after you have done all these steps.
6.Voila! Windows will install updates automatically by itself and there is no need to keep an eye on it any more.
First, open up Notepad by pressing Windows Key + R to open Run and type notepad to get a new Notepad window. Paste the following text:
Windows Registry Editor Version 5.00
Save the file with CTRL + S --- name it whatever you like, but be sure that it ends in.reg to make it a Registry file.
Double-click the new file and confirm adding it to the Registry.
Now, you can restart the computer to re-enable automatic updates, or open the Start Menu and choose Control Panel > Windows Update to check for updates on the web manually. You should find new updates waiting for you, despite XP not receiving any updates since 2014.