HELP! Accidentally backed up to the HP Recovery Drive (D:)

Hello,

I searched the internet but couldn't find a solution I felt comfortable with.  I accidentally did my Norton 360 backup to my D: drive.  Is it safe to just delete them, since I can't access the recovery partition section?  I am getting the message that my memory is low.  Thank you in advance! 

 

P.S. I have an HP Pavilion p6774y with Windows 7 (missed the free upgrade) preloaded from Best Buy back in 2012 (maybe).