Reinsalling Windows 7 without Recovery, Backup and CD's

Hey guys! I need help! I recently bought a laptop (Dell Precision M4600) through Offerup. I got the laptop but, no Windows 7 Pro installation disk along with the factory installed drivers disk. They installed Windows 10 and I don't like it. I did the Reset thinking it would reinstall Windows 7 and it completely deleted everything drivers and all (oh I didn't do the back up) it reinstalled Windows 10 and now its running slow, it loads up slow, I can't download from Windows Store, if I do download a program it take forever. Watching videos it freezes and it refreshes on its own or it will kick me off of the internet.  I tried the Support Chat but the Warranty is expired! I submitted a Warranty Extension Request a couple days ago, I haven't heard anything yet. 

How can I reinstall Windows 7 Pro 32bit and all the drivers and software the laptop came with?