Can we Install Windows 7 or 8 on Samsung NP305E5Z-S01IN

Yes the system will support either Win7 or Win8.

if the system can take 8GB of memory that would help the performance in general if using a 64-bit version of the OS
 
Thanks for our response.

It comes with a Free-DOS and it has got 64-bit architecture.

Problem is thatIt has got 1 GB Dedicated Graphics....So What is the effect of a Graphic Card on the battery of the laptop?