500 Error on Admin Page after installing APSB13-03

I'm running CF 9,0,0,251028 on Server 2008 R2 x64 with IIS 7.5. I installed APSB13-10 without any issues. I then installed APSB13-03 and after doing so the CF Administrator page returned a 500 Internal Server error. My CF websites continued to function. I rolled back and everything started working again. The problem is I am required to install this patch due to network security requirements. Is there anything I can do to get the Admin page to function after installing APSB13-03? Or am I missing something?

I am a little bit confused with the complexity of installing CF updates as I already have hf900-00010.jar and hf900-00013.jar files in my {ColdFusion-Home}/WEB-INF/cfusion/lib/updates folder, and this update puts an hf900-00009.jar in there, which seems like it might be an older file. Currently everything is working since I rolled back, but I have to install this update and after troubleshooting the 500 error I finally had to roll back. I have no idea what could be happening. Thank you in advance for any help!