Hi, welcome to the forums
The first thing to do would be to copy your personal files from the desktop to a personal folder, Downloads
is as good a place as any. That way you can guarantee that the files are definately in your user folders. Also, you may want to copy the files from C:\users\Sara\Desktop
to make sure that ALL desktop icons are present.
If you are prompted to overwrite any desktop files you can choose to do so or skip as they will be the same file and will not cause any issue
Next, you would want to enable the Built-in Administrator Account
and reboot your machine. Log into the admin account (there should be no password) and try deleting the Sara
folder from C:\users\
and see if it works.
You can then disable the admin account (using the above tutorial), reboot then log on as yourself.
Hope it helps.