CPU sounds like it's maxing out. All you need to is find out why. Sounds like you're looking in roughly the right place - ctrl/alt/del to get the summary. But you can drill down by clicking the Performance tab then click Open Resource Monitor (bottom left)
There you can click on each tab and see exactly what is going on. Click the CPU tab then click on Processes to expand it, also Services. In each you can the Average CPU to sort it (highest first) to get an idea of what is using it.
The culprit ought to be obvious (at least the name should, even if you don't recognise what it is). You can see a graph to the right which will show CPU usage.
So once you've identified the task then we can decide what to do about it. Might be the indexing service or your browser. Or an update. I had one that took over a day on a small laptop and it had exactly your symptoms. If that's what it is you can either turn of updating (undesirable) or just leave it running till complete.
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