My iPhone 5 wont connect to my itunes

Hi every one

I posted this same problem up a few months ago and i have tried everything that people had posted and i havent managed to fix the problem. So im just going to run through it again and hope someone might come through with something new that i havent tried so here goes this is the story.

My iPhone 5 or iPad Mini used to connect to itunes fine but now have suddenly stopped for some reason. Im sure that the problem is something thats changed on my computer because it connects to an other laptop no problem so something isnt right.

Ive tried pretty much everything on the apple site that people have recomended but was just woundering weather anyone knew anything else.

I also have an iPod Nano but this has the old 30pin connector lead and heres the weird thing it connects no problem so why does the iphone and ipad not connect ??????

I have tried differnt leads and a connector which connects to my iphone then connects with a 30 pin connector and no luck .

Any help would be very grateful

Thanks