Hello & welcome to TSF,
here is a link to a program that will deleat the folder on a reboot
read instruction on how to use
or you can try this method
Delete an Undeleted File
Sometimes files can become corrupt, in which case Windows XP prevents you from deleting them and displays an error message that says the files cannot be deleted because they are currently in use. Even if you reboot your computer and try to delete the files again, usually you see the same error message. To force Windows to delete the files, try the following steps.
To delete common files:
1. Choose all open documents and programs that are currently running.
2. Shut down your computer, and then reboot it.
3. Return to Windows and try to delete the file again.
4. If you still can't get rid of the file, shut down your computer.
5. Turn on your computer and immediately press the F8 key on your keyboard several times until the Windows Advanced Options Menu screen appears.
6. Use the up or down arrows on your keyboard to select Safe Mode, and then press the Enter key.
7. The next screen displays a message "Please select the operating system to start." Assuming you have only Windows XP installed on your system, press the Enter key. If you have more than one operating system installed, use the up or down arrows on your keyboard to select Windows XP, then press the Enter key.
8. Windows loads some software, which could take a minute or two. Depending on how your version of Windows is configured, a login screen or the Welcome Screen appears. If you see the login screen, type your account name and password (if you have one), and then press Enter. If you see the Welcome Screen, click the icon for the account labeled Administrator or an account that has administrative privileges, and then type your password. (if you have one).
9. A message alerts you that Windows is running in Safe Mode. To proceed, click the Yes button.
10. You can use the Safe Mode in much the same way you use the regular Windows mode. Locate the undeleted file, and try to delete it again.
11. If you are successful, reboot your computer and return to the regular Windows mode. If your efforts are not successful, seek the help of a certified computer professional like Geeks On Call.
To delete videos with the file extension .avi:
1. Click the Start button in the lower-left corner of Windows
2.Click the Run button.
3. A window opens. Type regedit in the blank, and the press the OK button or the Enter key.
4.Click the OK button or the Enter key
5. The Windows Registry Editor opens. In the left window pane, double-click the registry key labeled HKEY_LOCAL_MACHINE. If you can't find it do the following:
a. In the left window pane of the Registry Editor, scroll to the top.
b. If any of the HKEY registry keys are open-- as indicated by the minus sign(-) on their left side-- then close them by clicking that minus sign. When a registry key has been closed properly, it will have a plus sign (+) next to it.
c. Repeat this process for the remanding HKEY registry keys until the only things visible in the left window pane are the five HKEY keys.
Double-click the HKEY_LOCAL_MACHINE registry key.
6. A new column of registry keys appear. Double-click the Software registry key.
7. Open the Classes registry key.
8.A long list of registry keys appears. Scroll down and double-click CLSID.
9. Another long list of registry keys appears. Scroll down and double-click the one labeled
10.Right-click the InProcSever32registry key, and then select Delete.
11. You are asked to confirm the deletion. Click the Yes button.
12. Exit the Registry Editor by clicking the X button in the upper-right corner.
13. Shut down your computer and restart it.
14. When you return to Windows, you should now be able to delete the .avi file.