Open a command prompt window and leave it open. Close all open programs. Click Start, Run and enter TASKMGR.EXE - go to the Processes tab and End Process on Explorer.exe. Leave Task Manager open. Go back to the Command Prompt window and change to the directory the AVI (or other undeletable file) is located in. At the command prompt type DEL <filename> where <filename> is the file you wish to delete. Go back to Task Manager, click File, New Task and enter EXPLORER.EXE to restart the GUI shell. Close Task Manager.

Jack.

main problem with 'undeletable files' is that they are read only. other possibility is that they are in use by a process, quite possible a windows required process. the only way to get rid of that, is to write an app (or find one) to delete it on startup, before the process that uses the file is called. if anyone needs and example app, ill be happy to write it.

Another method that sure works is to boot up your computer to DOS mode. And delete the file(s) like working on a command prompt.

Loading Windows makes alot of system files undeletable.
Otherwise, use HijackThis program.

well,you could also change its name and move it to another disk then delete directly or by taskmgr.also from safe mode to enter your system to delete them...if certain .dll file could not be deleted.you can also use regsvr32 command to uninstall it.

e.g regsvr32 /u d:/program/*.dll

however, if the file is in use by a process, you cannot rename, move, or delete the file. You have to edit it while the process is not running.

There is a utility named "deletedr.exe" which I use. (Available off a download site @ www dot diskcleaners dot com)
It has never failed me, yet.
Occasionally you run across a file that requires a re-start to delete, but deletedr has worked every time.

yea, those are the ones in use by processes at the moment.

Also if you want to securely delete the files (no chance at recovery regardless of what software you try), you could try such freeware utitlities such as SDelete ( http://www.sysinternals.com/Utilities/SDelete.html ) . Again, thats only if you have sensitive information contained in the files (credit card numbers, financial data), and you dont want someone snooping around.

terminated the explorer.exe??? it's interesting.but i think you can use a cd rom to startup the computer then on the dos ,you would deleted it.

yes... deletedr.exe is an alternative for the built in windows delete utility. What are you trying to say? Booting up with a cd is just a command prompt. what do you mean by "terminated the explorer.exe" ? explorer.exe is the windows shell, which is just the interface such as the desktop and the taskbar. I dont see it mentioned anywhere on this topic