Shawn,
I haven't seen this specific issue before. However, I see you are an internal TI user. I did run into an issue recently with a Symantec update install stuck running in the background and which was causing other processes on the PC to hang. Could you have a look at the Windows process list and see if you notice an other install processes running (look for MSIExec, for example). Also, have you rebooted your PC recently? If not, could you reboot your PC, delete the contents of the C:\ti folder, and re-run the installer? Let us know how that goes.