Try doing a Windows 8 refresh, which will cause you to restore all of your other software, but you will have a Windows 8 only copy not an updated version of the OS. The refresh will give you a list of programs you will need to re-install.
The .Net stuff is part of Windows 8, so do a Windows Update after the refresh. Followed by installing of the CCC 13.8.
I have had issues after upgrading from Windows 7 to Windows 8 myself as well as several others. It seems for some systems the registry gets corrupted.
AMD A10-5800K, XFX 7850 Ultra OC Edition 975MHz, 16GB RAM, Win 8.1 Pro 64 bit, MSI 7778 motherboard, 500W PSU, HP P7-1235, CCC 13.12 WHQL