Well, I had the same problem, I have W8, but it seems some ppl with W7 couldn't get it to work, so the solution for me was:
[FIX] Installed TWRP and now you're stuck after OTA? - Page 7 - xda-developers
In XDA is the solution (the thread is for TWRP but works in CWM as well, I did it)
[FIX] Installed TWRP and now you're stuck after OTA? - xda-developers