Photoshop Scratchdisks Full

Hi, i'm working with photshop cs2 *installed on my :c/ drive. I checked the memories but was rather confused by problems that were similiar to mine. Also don't think they'd help because i figured they were for the e drive only. What does the E besides the links to those entries stand for just for the e drive? ): Anyways my problem is apparently my scratchdisks are full and i don't know how to empty them can anyone help? Also how come my photoshop won't open certain images at times i often get a message that says can't open document/file it has an invalid jpg/png marker o.O.