Help Please re-Windows10

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I had to roll back to the previous version of windows 10 after the last update added cortina.

The result was my laptop slowed down so much that at times what should have taken brief seconds froze the screen for minutes and looking at the task manager (again minutes to load) showed the cpu was working at 100 percent.

Having rolled back to the last up-date I now find Google chrome and windows explorer will not let me into Amazons web site (my own stored links or using direct links from BC's website, or even google's own web page links. It also will not let me into Wikipedia or Windows own website. When it rebooted it did try to load tgstories website and banned that one, though I don't remember ever going their before. It does not seem to have a problem with any other web site.

I haven't a clue how to fix the problem. Any help would be most appreciated.

Sophie

Laptop details

HP Pavilion Beats auudio

Processor
Intel Celeron CPU N2840 @ 2.16GHz 2.16GHz

RAM:
4.00GB (3.89 Gb usable)
System type:
64bit operating system, x64 based processor
touch support with 10 touch points

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