Getting rid of them is probably not too difficult - use Windows Explorer to delete them which is easy, particularly if they are all in one folder as they probably are. Follow these pictures for instructions :
(1) Open Windows Explorer - http://imageshack.com/a/img534/9105/5ox9.jpg
(2) Navigate to the folder where these files are and select it, then click Organise, then Select all - http://imageshack.com/a/img33/3512/s4js.jpg
All the files in the folder will now be selected, high lighted in blue.
(3) RIGHT click anywhere in the blue area and a pop-up box appears - http://imageshack.com/a/img850/1317/yu63.jpg
(4) Then click Delete and your files will start to delete - http://imageshack.com/a/img534/1762/pn7y.jpg
If you use the 'Recycle bin' you will find that all these files have been transferred to it and you will need to empty it to finally delete these files.
Your real problem is what is causing these files to multiply, and off the top of my head I have no idea. Let us hope somebody else comes up with an idea for that.