You need the dell drivers for your laptop and there are no win 7 drivers for 7th Gen processor. Reinstall windows 10. From this page-- www.dell.com/.../operating-system it says-- Windows 7 and Windows 8.1 operating systems not supported on *7th Generation Intel® Core™ processors.
I have installed Windows 7 in Dell OptiPlex 3050 with 7th Generation Processor. However, I am having problem installing the Video Driver as stated in the link below Intel HD Graphics 510 / 530 / 630 Driver [URL] The error that occurs is  " The windows does not meet the minimum requirement of the driver" Is there any alternative graphic driver I can install to my desktop? Thank you.
Dell OptiPlex 3050 Windows 7 Graphic Driver