BUG #7638: postgresql taking up all my hard drive space

The following bug has been logged on the website:

Bug reference:      7638
Logged by:          shawn darling
Email address:      gryphonsegg@gmail.com
PostgreSQL version: 9.0.0
Operating system:   windows 7
Description:        =


I need to know can i get rid of it or what is it even for? how do I at least
leesen the ammount of space its taking up? 191 gigs?