1 - Microsoft will absolutely NEVER EVER call you. They don't have your phone number.
2 - Microsoft have absolutely no way of knowing that you have any corrupted file. Also, they don't care about eventual corrupted files. A corrupted system file will be auto-corrected in most cases on your next boot. If not, a simple system restore to a previous state will do the trick.
3 - There is no such thing as an "Auto respond" report.
It's definetely a FRAUD attempt using publicly available phone numbers (online phone books), and attampting to dupe unsuspecting peoples.
You could get such a call about pretend Windows file corruption if you have a Mac, a Linux box, or even if you actualy don't have any computer...
Electro, March 2012