I have bought Dell inspiron 14z ultrabook, windows 7 home edition.

I have problems with connecting to internet. My internet connection is lost after 2-3 minutes.

I read somewhere that this was due to latest updates to macafee. I have tried the using some guidelines how to fix this issue which was posted on dell support website.

Despite following all steps I am still having same problem.

I have also run diagnostic test on my laptop and every part is working fine.

I have unistalled antivirus but I am having same problem (no internet action after every 2-3 min). My wireless router is brand new, works absolute fine. 

Please suggest some ideas ASAP or else I have to return this laptop back to dell and get another one, but not dell!

Thanks