When you have current OEM dvd it takes less time to get back to working and does not require you to be online to get to bootable recovery. None of the recommendations included in this post are a waste of money because the important parts like drives and dvd and power supply and video can be carried forward to a newer or even brand new PC if its the right model. I also tend to have the DUAL LAYER burnable DVD disks that are now required to make recovery DVDs now as well as a stash of USB2  16 and 32 gig FAT32 sandisk flash drives. [URL] I still however every once in a while buy the $12 dvd and end up giving it away to my friends when they crash and otherwise cant actually afford a new computer. [URL]   Most All Dell models from 2006 to now work when you have at LEAST 4 gigs ram and at least 250 Gig hard drive or SSD, That includes desktops and laptops. The Optiplex GX620 tower is a very special machine. You can use it for recovery and it has both SATA and IDE interfaces. It also works with ALL versions of the software from MSDOS all the way thru Windows 10.  Its not a speed demon but its fine for most things.  Has optional legacy PS2 keyboard and mouse as well as parallel port and Serial Ports.   Combined with latest bios and Pentium D 915 you have an oldie but goody that works with EVERYTHING and the TOWER can take an EVGA 700BR power supply. [URL]   GT1030 Video card and an HDMI to VGA adapter means it runs all monitors from VGA 1985 to  4K samsung HDMI TV. Add an external USB2 Blueray drive and you have reinstall for cyberlogic power DVD playback as well as Disk burning for blueray and DVDs [URL]   [URL] if whatever you buy comes with at least windows 7 the update to 10 is still free.  You use the I dont have a key option for install or for older media you use a generic home or pro key for install The generic key cannot be used to activate but it will install without issue. Once you get online you can activate using the SLUI 3 command or the change my product key option and use the key thats on the windows 7 home or pro COA sticker.    
I had a failed Windows Update and my system was unable to boot. I booted to the USB Recovery I made when I purchased my System. I tried to run System Restore and I saw a message that System Restore was turned off.  This has happened before where System Restore get's turned off, I turn it on and a few days it is off. How can I fix it where it stays on?
XPS 8930, Cannot boot failed Windows Update