Never suggest users to turn OFF the UAC, what's wrong with you ?! If that is the case (I don't think so), this can be resolved without turning it off.
1 - what type of windows account do you have ?
2 - check the network settings and make sure nothing is blocking access
3 - make sure that Origin has read/write access
4 - make sure that your account has read/write permission
5 - try running Origin as an administrator
6 - try doing a clean install of Origin, including manually deleting the left overs in the Appdata folder
Try doing these and post back with a status.
If none of these work, I suggest you contact support directly and have a live chat, they should be able to help out with this.