Nope, we'll get that backed up, along with any Documents, Pictures etc before reinstalling
No worries at all, it's not a problem, we'll hopefully get it all sorted soon
As the Service Pack has failed to install again, it's going to best if we try now to reinstall Windows. As you have a Dell Inspiron running Windows 7, you should be able to follow the instructions here to reinstall Windows 7. Before you do so, make sure you backup any files you want to keep, as all data and programs will be removed. Most people choose to backup their Documents, Pictures, Music, Desktop items, Emails (if using Windows Live Mail or Outlook) etc before doing a reinstall. If you use a web based email service like Gmail, Hotmail, Yahoo Mail etc, the mail is usually stored at their end.
You can backup your files using the built in Windows Backup and Restore program. A useful video on it can be found here. Or you could just open up your folders such as Music, and then copy and paste the files onto your backup device like a USB Hard Drive or Memory stick for example.
What device do you have for making a backup, do you have an External Hard Drive, Memory Sticks or DVD's? I'm only asking because if there is a lot of Music or Videos, you may not have room for them on a USB Memory Stick or will need to use several DVD's.
Just take your time with the Backup and make sure you have what she would like to keep. Let me know if you have any questions or problems.