Can't get itunes to recognize my iphone

Yes, I just downloaded the new version. I've rebooted several times and I've unplugged the cable and put into a different USB port. Did every trouble shooting step.

I just tried it all again and this time I got an error message saying that the "iphone could not be added to itunes because of an unknown error (0xE8000035)"

I do realize I'm talking to myself here haha. Well, now it seems to be even weirder because I juet kept trying and trying and it finally recognized the iphone but then after I start syncing, it cuts out after about a minute or two and I get an error message saying there was an "invalid response recieved from the device". So I hooked it back up and it recognized it again (after several tries) so I hurried and manually tried syncing some of favorite songs and then it cut out again, when I checked the phone only the ones I added the second time were there, the first round of syncing had been erased. It's a vicious cycle I'm in here! I had this phone for a day and I HATE it!! I'd rather have my dinky little razor phone that at least had video and zoom capabilities. So far all I want to do is take this thing and chuck it into the street!