|see the following forum:|
They are from a back up program that no longer exists. Response number 5 shows a new program that apparently open/restore them if you need to. Though I would recommend the following:
Since your computer system works, delete all but the latest dated one(s) and burn them, if you want security, to CDr or DVDr (as above), then delete them completely. After that you can use some of the recovered space to create a new back up plan (either manually, or with a program that you can trust). Once you have a new back up in place, you will not actually need the old one(s) anyway. I do not recommend keeping too many copies of back ups, but I do recommend keeping them on a different drive than the originals are on. Some prefer backups only to removable medium to protect them from infections, the most secure would be daily backups to a separate hard drive (internal or external) and weekly copies made of it to CDr's (or DVDr's) for absolute replacability.