Unfortunately, it looks like one or more Windows system files have gone corrupt or the HDD is failing. :doh:
Generally if chkdsk fails to fix the issue, the next thing I would do is take out the hard disk, put it in an external HDD enclosure and attach it to a laptop or another PC to copy the information (documents, photos, etc.) from and then check if it has any bad sectors. If the HDD is fine, I would put it back in the PC and install Windows from scratch or perform a system recovery (F11 or Ctrl + F11 option at boot) if that PC had a recovery partition on its hard disk.
If you decide to try the enclosure method, you'll need to find out whether the hard disk is SATA or IDE. The simplest way to check is remove the PC's side panel and check whether there is a ribbon cable (~2"/~5cm wide) which is IDE or thin cable (~1/2" or 8mm) which is SATA. The colour of the cable is usually white, grey, cream or black or IDE or red, yellow or orange for SATA.
Once you know what type of cable it has, you can get an external enclosure to match this. Alternatively you can get a combination type enclosure to handle both, e.g. the Akasa Integral for IDE & SATA.