Which operating system? Computer make and model number?
What "files" are you referring to? What "service pack backup files"?
Do you already have an Acronis image created?
System Restore is easy to use.. Restore back to a time previous to the problem and see if it fixes your issue.. If it doesn't, and you've got an Acronis image, then use it. The image will only replace those items that we installed on the computer when the image was made.
Hope this helps.
Would system restore or Acronis image be better to recover these files?