Unable to delete Graph Trees

[squeekinator]

Hello,

I am unable to delete anything in the Graph Trees section. I am logged in as admin and I created a few "root level" categories. I click the red x on the far right and it asks me "are you sure?". I can can either cancel or delete, but I click the buttons and nothing happens, nothing loads, nothing refreshes, it just sits there like the buttons are broke.

Any help would be greatly appreciated.

Thank you.

Operating System:Win 2008 R2 64-bit
Webserver: Apache HTTP Server 2.2
Cacti: 0.8.7g
Spine:
MySQL: 5.0.51a
PHP: 5.2.14
RRDTool (Cygwin or Win32 version): RRDTool 1.2.x win32
Net-SNMP: NET-SNMP version: 5.5
Cygwin (cygwin1.dll version):
Plugin Architecture:

[noname]

Though I'm not sure in detailed,
if you are using IE(7,8,9), try another browser.
(Or try compatibility modes)

[BSOD2600]

Additionally, have you installed all the cacti patches yet? http://www.cacti.net/download_patches.php