Nugs2073: I just tried to do what you guys say and it still didn't work. Honestly this is getting vary frustrating and i am not sure if i will even keep playing at this point unless i find a fix for this soon.
Don't give up yet, I think we can figure this out. I just found the following page:
http://www.reddit.com/r/witcher/comments/32al3e/why_do_you_do_this_to_me_game/
Which suggests that the Witcher 2 Enhanced Mod Compilation is almost certainly the culprit. But we have to figure out how to get it to disable properly so that you will be able to craft. On that page it sounds like the poster disabled the mod rather than fully uninstalling it. Maybe that's worth a try?
I would suggest reinstalling the mod and turning it back on, then checking the crafting screen again. If it won't let you craft, try disabling BUT NOT UNINSTALLING the mod (i.e, just uncheck it on the mods menu, but don't fully uninstall it). Then see if it works. My guess is that maybe the mod got uninstalled but was never officially "disabled" first, so it got bugged out.