Can I reinstall activated windows 10 after formatting my hard disk?
Okay, I have read rest of the answers but let me give you the proper directions.Follow these instructions.Note: Contact Microsoft and ask if you reenter product key, will it work for your computer or not?!First save the product key by going to “My computer - Right mouse click - Properties, now scroll down and note down the product key.Create a image recovery file or recovery disc, you can do that by watching any video on youtube.Remember, make sure that you know where to find your pc or laptop drivers or your doomed later on, it happened to me.Insert disc and format you C or the partion with windows installed.Now you can enjoy Windows 10 fresh install.Enter the product key.If you like my answer, vote it.
Will my computer's hard disk get erased if I install Windows 10?
It depends.There are two ways by which you can install windows 10. One is by downloading and installing winodws 10 using the “Get Windows 10” button which would be present in the system tray, in case you were using Windows 7 or Windows 8.1.Other method is by downloading the iso file for Windows 10 from some third party websites, and making a bootable USB drive or a disc, and installing it from there.No files will get affected if you are to install Windows 10 through the former method. Everything, including those softwares and applications you were using will remain intact. You will not have to install them all over again.But, if you choose to install Windows 10 using the latter method, The Local Disc partition in which you choose to install windows 10 will get formatted completely. Therefore, backup all your necessary files and folders before the installation.The last date to upgrade to windows 10 using the former method was 29th of July 2016. This makes you necessarily stick to the latter method of installation.Happy upgrading!
How do I install Windows 8.1 64 bit over Windows 7 32 bit?
To install a 64 bit version of Windows you must have an 64 bit CPU.If you are not sure about this, press Windows+Break on your keyboard. In "System Type" you will read "32-bit Operating System". If after this there is "x64-based processor" then your CPU is 64 bit.Now the problem is that you can't install a 64 bit version of Windows over a 32 bit. So the only possible solution is a clean install.But if your CPU is 32 bit you CAN'T install a x64 version of Windows. Try installing the 32 bit version or upgrade your CPU.
How many GB USB do I need to install Windows with it?
Amost all version of windows require atleast 4 GB of USB drive.For 32 bit usually its 4 GB and for 64 bit its 8 GB.You can use this tool to create a boot able USB. Create bootable USB drives the easy way
Will I lose data on my computer if I update to Windows 10?
A Windows install can be done one of two ways: clean or upgrade.If you have a computer running Windows 7 or Windows 8 and you start Windows 10 setup it will upgrade your installation to Windows 10 with your programs, settings, and data intact.If instead, you start the computer directly from a DVD or USB you will be asked to do a clean install - and where to put it. If you put it on your existing hard drive where Windows 7/8 already is, you will likely lose your data.If you have a blank hard drive (or partition but let’s keep it simple) you can choose that instead. Windows 10 will install there and leave the other drive, the one with your data, intact. Intact but largely inaccessible to a novice because that other drive still contains Windows 7/8. When you first start the computer it will ask which OS to run.So that's three options. Choice number 1 is the simplest, most popular, and probably what you asked about. It's always possible to lose data during the upgrade but it's very unlikely. It's the most tested scenario in Microsoft’s labs and any loss of data is a ship stopping bug. Serious stuff, but that testing is done so that you can trust the process in real life. Still, make a backup.No other software company tests the upgrade scenario more thoroughly than Microsoft.
Can I install Windows 8/7 in a laptop that comes with Windows 10 installed?
You can install a separate partition, if you have enough HDD space and yes, you need to install drivers separately, as Win 10 and Win 8 won’t be able to “get to know one another.” Before you proceed, MAKE A BACK-UP of all the data, to avoid losing photos, audios and other documents. To install Windows 8, do the following:Insert the Windows 8 Installation disk/USB drive;Restart the PC go to BIOS and set the DVD-ROM/USB drive as the first boot device;* In BIOS navigate to Boot Device Priority (or to First boot device on some BIOSes) and move the DVD - ROM/USB to the first place, using the arrow keys and Enter.Exit BIOS and press any key once asked;Follow the on-screen instructions and once you see the drives, delete one of the drives (not the drive Windows is installed in (usually, Drive 1, the smallest in GB size - not the system-reserved one);* MAKE SURE TO MAKE A BACK-UP of all the data, before you delete the drive.Make new drives (one at least 97.5 GB - write 100000 and the other, with what has remained of the drive you deleted).Install Windows 8 in the small drive (97.5 GB);You can also consider installing VMware, in Windows 10, and install Windows 8 as a virtual operating system.Sources: Don't know how to install an operating system (Windows)