Every PC lover is excited about a window 10 upgrade and waited for long after reserving it from their laptop or desktop which is only available to existing user of window 7 and window 8.During the reservation of a copy of window 10 it said that it will take 3GB of data to download this version and some hours too. So i got ready with my all stuff and put laptop to do window 10 downloading but at 3G speed it take almost one day and one night to download it.Even after full downloading it takes hours to ugrade window version with several restart.Aftr installation when i checked my 3G data i found that more that 3GB of data is gone and still when i start using window 10 it keeps on downloading the latest version of drives to make it work.So if you are going to upgrade than make sure you have more than 3GB of data. Nom comes the performance part after installing it the laptop start getting slow and start hanging,when i trying to switch it off then it takes a longgg time . So i have to f...