Hardware Help

You could buy an enclosure, pop open your old PC and use the hard drive that way.

get either a usb3 external drive like this  and re-download all your older stuff to it, you might find that in order to pay the games you need to move them between the on-board hard drive and the external for better in game performance

or as others have suggested something like this or this key things are must be usb3 and sata III (3) for best performance, the 3.5" caddies (enclosures) are often a better buy if your thinking of upgrading in the future since you can just buy a cheap 7200 rpm drive and crack on.... the advantage of the smaller drive case is its more portable so better if your on the move a lot but that tends ot come wiht a trade off in terms of performance 

or if drive cloning or having expansion space is more your thing then this is a pretty good option 

*NB: all links are to amazon UK and are intended as illustrations of the products you should be looking at, not recommendations of that specific item, although the transcend is really good as a portable media store and works well as an xbone expansion drive and can be used directly with a usb capable tv for a tv controlled pvr or movie playback in the experience i have of using half a dozen for the last 7 years....( i should probably think about replacing the older 3 actually given that they are hammered on a daily basis and are 7 years old and anything the kids use can be considered as critical failure equipment)

regardless of whats wrong with your now dead laptop i would pull the hdd(s) out of it and keep them, and sicne it is already dead i would probably google the problem and have a go at fixing it, having fixed many laptops over the years there either a mobo replacement (beyond economic repair) or something simple and cheap to replace.... if its old and the batteries dead just forget the battery and run it off the mains, if it has one of those stupid no battery attached switches chances are the switch broke or you can just plug it in the "battery fitted" position with a paper wedge.... (shitty dell hardware) 

if your looking at buying a new pc, wait a few months for ram prices to start dropping, after ryzen refresh comes out buy something from original ryzen line up for under $500 (mobo/cpu/ram) bang on a cheap gfx card and a 30 dollar case and a sata 3 ssd (or preferably one 250gb one for the os and a 500gb+ one for games etc) skip getting a spinner and dont waste money on nvme/m2 drives (there not worth the money) total system build should be under $700 excluding display... 

oh and before you go ripping the old lappy apart check its actually dead and not just the psu, if you have an old power mode fan lying around, pull the pins out of the connector block and lightly tap them across the outlet of the dc adaptor for the laptop... if it spins on the first tap dont bother to repeat it you'll just break the fan, if it doesn't move at all and didnt make popping noises or emit a puff of smoke the power adaptor is likely dead....

but either way whatever you do not let your data get into someone elses hands, you have no idea exactly whats stored on those drive(s) and just what the tech who gets hold of your "dead" device will recover  from them... better to just keep them....

yeah i figured the actual parts i picked wouldn't be available outside of the UK, i know that amazon.com does have lots of similar items on it though the biggest problem is older tech masquerading as new tech /

laptops are normally either really easy to repair, or a pointless expense. 

but anything that wasn't top of the line in 2010 isn't going to be capable of running w10 today and unless its newer than 2015 its likely not worth fixing either, one of the worst "breakdowns though has to be the medion/target laptops appearing to be totally dead becasue the cmos battery needs replacement, its a pita to get to without stripping the machine down completely and unless you know about it will be something you totally overlook .... thats why so many of their spares or repairs laptops appear on ebay... and if its a windows 10 system with uefi secure boot active you probably need a new hard drive as well..... the cost in man hours alone will be prohibitive (last one i did took 30 hours to get back to working condition much of which was replacing the operating system doing all updates then cloning across all the personal data from the old drive, at tech rates of $50/hr it costs more to repair than to replace, lucky for them i wasn't charging based on hours taken like the local pc repair places do)