As far as Im aware when people delete their files in the recycle bin- the data doesnt actually get wiped off pc memory/storage.
1) I want to know how I can wipe off data from a computer/pc memory- when Ive already deleted it from the recycle bin? 2)Do I need some specialist software or can I do this using windows facilties? 3)Is there any danger using other software to wipe off data from the memory?
Of course there is a risk when using the mentioned file deleting programs. That is what you want if you really need such a program, but you must be very certain to target the particular file, and no others because ther is no going back.
In time the file you deleted in Windows will be gone anyway since sooner or later the 'space' is is overwritten.
Have you tried CCleaner (a free download) which will empty your bin and delete the history as well?