My computer recently attempted to run a backup and failed with the above error code. I tried creating a new backup on removable media, again this failed. I watched where the backup failed and found some files that were behaving oddly, including one that was nameless, without file type, size or properties. The more I deleted, the more I found.
I ran an update install of vista to repair my system files to no avail. Saved all my files to removable media and did a clean install, and still no joy. Oddly, my PHP folder survived the clean install. Deleted it, no luck.
I have run memory and hard disk diagnostics and everything looks fine. Most perplexing. Any help would be appreciated. I have started a thread on the Microsoft Answers forum and started a dialogue with Dell, my comp manufacturer, about it.