I've found Boot Camp/BCA not to work so well with Mavericks, especially with Windows 8/8.1. I ended up doing the following in order to get Mavericks and Windows 8.1 to co-exist in reasonable harmony on my late-2011 15-inch MacBook Pro.
1) Clean install of OS X 10.8.5 via USB stick so Boot Camp 5.0 will be available right away.
2) Download Windows Support Software from Apple (not using Boot Camp Assistant), copy to separate USB drive or DVD.
3) Run BCA, don't check the box to download the support software, set up partitions as desired.
4) Install Windows 8 from DVD as normal.
5) Perform all Windows updates. Reboot as required.
6) Install Windows support software from USB/DVD by running setup.exe in compatibility mode for Windows 7. Reboot as required.
7) Remove the display driver (AMD Radeon 6770M in my case) via Windows device manager, which is accessible through control panel/system. Open up the display adapters, right click on the Radeon entry, and select uninstall. Do not reboot.
8) Remove the Cirrus Logic audio driver through the Programs and Features section of the control panel. It's toward the bottom of the list. Reboot.
9) Download and install the latest
AMD Catalyst Mobility beta display driver. Reboot.
10) Install Windows 8.1 from the MS "app store." The first reboot after the installation process starts makes it look like the system has frozen, but be patient, it is working.
11) Once 8.1 has been installed, and you've configured it to your liking, reboot back into OS X.
12) Set your startup disk to OS X in system preferences. Reboot.
13) Download and install Mavericks.
This was a lengthy and at times painful process of trial and error, but i think I've got it licked. Step 8 was mainly the issue. The Cirrus Logic audio drivers provided by Apple are the only ones I could find, and I spent a good long while searching for updated ones. The default "high definition audio device" drivers Microsoft provides as part of the standard Windows 8/8.1 installation are more current and perfectly adequate.
Hope this is somewhat helpful.