Unknown desktop screen captures

hie,i am using windows 7 64 bit , with 3.5 gb ram, 1 tb hdd slave and 160 gb hdd master, i recently found out that i had about 4 700 images (jpg) all from screen captures i did not do, amounting to 6 gb in C:\users\my username\AppData\Roaming. i would like to know what causes this and how can i get rid of it?

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