someone teach me how to delete with DOS

I can't delete this 700 mb file and I'm really getting frustrated. Can somebody teach me the DOS command of how to delete?

First thing I would try would be to start your computer in safe mode (press f8 while booting) and try deleting from there. Also, run chkdsk (right click the drive in My Computer, choose tools and check disk for errors), just in case it's a messed-up FAT/MFT. Failing that, you can delete within DOS (provided the drive isn't formatted with NTFS, then things become a bit more complicated). The two commands you'll need are...

cd - change directory. Used to navigate to the folder the file is stored in. eg. "cd myfolder". Also, "cd .." takes you up to the parent folder.

del - delete file. eg. "del stupidfile.avi"