I've seen this problem, and it's origin and resolution is kind of a puzzle. Many people have had this problem and there are multiple solutions which seem to have worked for them. Try these (reboot between each and try deleting your files)
1) Do a "chkdsk /f /r C:" at an administrative command prompt, allow it to run and finish (make take some time)
2) Defrag the hard drive using the Windows defrag tool
3) Run "sfc /scannow" at an administrative command prompt
4) Run "DISM /Online /Cleanup-image /Restorehealth" at an administrative command prompt
Would be interested in knowing which if any of these steps has resolved the issue for you.