When dealing with a semi dysfunctional system, one can never know what will or what won't work.
Here is an idea that might serve you.
I'd like to be clear that I'm not suggesting you take this route first.
I would just like to make you aware of the option, that may come in handy.
There is a feature in Recovery in the Control Panel that allows a user to create a recovery drive out of a 16 gig (or more) USB thumb drive, essentially copying the recovery partition and making it bootable.
Let's suppose that your computer is running so poorly that you can't get to the advanced recovery area, where you'd go to do a system refresh, or perhaps you could get there, but the slowness of your system, either made it impossible to do or take so long that you might wait a week.
That's where the USB recovery drive might show itself to be more useful, in your predicament.
As it is bootable, when you boot up with it, your Windows system on your hard drive is not running. It's all running from the thumb drive,
If luck is with you, it would refresh the system at the same speed as any normal refresh.
One last note.
If you wanted to boot from the USB drive, you'd have to get to the bios and make it the primary boot device.
There's a bit of a song and dance to go through to get that done, but I won't bore you with the details of this procedure, unless you do run into problems with a refresh by conventional means, in which case, I can give you the step by step instructions.
All is well in Paradise.