Windows 8.1 Pro - Tablet unable to connect to the internet using Wifi

I have an HP Envy 2 tablet running Windows 8.1 Pro.

It's been working happily for a while, however the Wi-fi was getting a little unreliable. I've had a go at fixing it but now seem to have broken it beyond repair. Sadly I cannot tell you what I did to stop it working as I've tried so many things to fix - I'm confused.

The tablet is set-up are part of a domain on Windows Server 2012. Lots of other devices are working fine on the network, other laptops, desktops, iphones etc... Wi-fi is working fine everywhere.

The tablet lives in an office 2m away from the Wi-fi router - so trust me it's close enough.
I get 5 bars of Wi-fi strength but for the life of me cannot get it to connect to the internet.

I can see the shared network drives and see the files on them, so am getting some connectivity
I am unable to ping the router at 192.168.1.1 reliably - sometimes works - sometime does not
I am unable to ping the server at 192.168.1.16 reliably - sometimes works - sometime does not

I've tried resetting the network adapter, reinstalling the Wi-fi device drivers, rebooting everything many times, renewing, releasing leases, resetting the DNS, changing from DHCP to fixed IP addresses, banging it and screaming - all to no avail.

Would love some further help please from a network God to get me connected again.
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Sean ClarkeOwner / ManagerAsked:
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John TsioumprisSoftware & Systems EngineerCommented:
Unless is a hardware issue then i am thinking of a virus ?
How easy is to restore it to factory defaults (format)....
I don't know if you can boot a live linux image from USB to exclude hardware issues....
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Sean ClarkeOwner / ManagerAuthor Commented:
It's not a virus - I've have scanned the tablet using all of the latest kit - and resulted in nothing at all.

Sure I can factory reset - but so really, really do not want to as it's a massive amount of effort to get the tablet back to it's current state, software, settings etc....
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John TsioumprisSoftware & Systems EngineerCommented:
An idea is to try to boot with Windows to go USB ....normally it should support booting .....setting it up with the correct drivers should give a clear indication of Hardware/Software issues
If Windows to Go o won't connect although it recognizes the network card then you have hardware issue....
Also another idea is to buy an extra WLAN adaptor...it won't cost much and will allow to check the tablet with ease of mind....
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Sean ClarkeOwner / ManagerAuthor Commented:
I solved this myself by rolling back one of the wifi drivers to the previous version and all is well now.
Odd that a small driver update (that happened automatically) can kill you whole network connection - still allow you to access remotely connected computers but kill your internet connection.

Go into device manager, find your network connection, choose update driver, choose browse my computer and when you get a list of installed device drivers, choose an older one that is currently installed - cured my problem.
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Sean ClarkeOwner / ManagerAuthor Commented:
Found this solution on a dark and hidden website. - But rolling back an automatic update to the device driver worked a treat.
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