Make sure you have copies of all the files you want on a flash drive or external hard drive. Then you can do a pc reset in Windows 10 which will remove all the bloatware, except the Microsoft stuff.
You'll still have Microsoft Solitaire Collection, etc. You can right-click on them in the start menu and click on uninstall to get rid of them.
If you still want to install Windows 7, do a clean install by booting with the Windows 7 dvd or flash drive, then select Custom, format all drives and delete them, then click on unallocated space and install Windows 7.
Also if your laptop is new and you want to install Windows 7, you'll need to disable Secure Boot in the UEFI/BIOS first, before installing Windows 7.
Secure Boot is only supported in...