BB Curve :: 9360 Device Memory Full?

I am using Curve 9360 which I bought recently. Love this handset for its sleekiest design, I rate this best among all BB phones.Recently I hit into an issue where my phone's device memory (reportedly 32 MB) is full. I thought this phone has inbuilt memory of 512 MB.When I go Media, check for Memory use using BB pin, it shows me Media Card and Built-in Memory Storage.
I am surprised to see Built-in Memory storage of only 32 MB and that is also 100%, of which 24MB was occupied by Pictures.

I haven't stored any of the downloaded or camera pictures on device memory. These 24MB is essentially from this folder "/Device/home/user/appworld/img/screenshots/". Under this folder there are many folders with 4~5 digits numbered and has many small pictures, essentially screenshots from app world.First, can I delete these folders in order free up device memory?Second, can I re-route these to memory card such these screenshots are not saved on device memory atleast?Third, how do I check 512 MB inbuilt memory usage stats for curve 9360?