How to delete undeletable files

Many times, one comes across files and wares in the computer which cannot be deleted by normal means and one wonders how to delete undeletable files or files which are usually the reason for slow, unresponsive and frequently stalling and hanging systems. While one wants a fast and a receptive machine to work on, the need to maintain the same is one which needs to be addressed on a regular basis. There are a number of ways in which one can find the solution to the question of how to delete undeletable file or files.