The option I am selecting on configuration screen is only create system level vm.My system is lenovo z50-70 with 4 GB ram.
Thanks,
Shubham
maybe u can try and create network vm after install instead of a automatically. Also 4gb is alittle low for Qubes, fyi prolly only be able to run 1 or 2 appvms at a time, but it should work fine.