Delete UnDeletable files in Windows 7

To delete undelatable files in win 7

• Click on Start
• Type CMD in the Search box
• Right-click on CMD and choose Run as Administrator
• Leave the Command Prompt window open, but proceed to close all other open programs 
• Right click on the Task bar and click on Task Manager
• Click on the Processes tab, click on the process named Explorer.exe and click on End Process. 
• Minimize Task Manager but leave it open 
• Go back to the Command Prompt window and change to the directory where the file is located. To do this, use the CD command. You can follow the example below.

Example: to change to the Windows\System32 directory you would enter the following command and Press Enter

cd \windows\system32

Now use the DEL command to delete the offending file. Type DEL <filename> where <filename> is the file you wish to delete.

Example: del undeletable.exe

Use ALT-TAB to go back to Task Manager 
In Task Manager, click File, New Task and enter EXPLORER.EXE to restart the Windows shell. 
Close Task Manager..