Windows 8 all USB Ports failure on Samsung 500T

Installed a mobile broadband USB device on my Win8 Samsung 500T. The modem would not initalize when connected so I uninstalled it through Control Panel. After a re-boot none of my USB ports are operational neither is the keyboard/mouse for the machine. HAve tried to reinstall/update USB drivers using the Administrator credentials, no good, I have purchsed Registry and Driver software nothing works. Did a scf /scannow it reported not all files were repaired, I beleive the fault is in the Standard EHC-compliant Host Controller, any ideas welcomed.
Note - I have installed the modem with the same software  on XP, Win7 and 2008R2 without a problem.
Mick MurrayTechAsked:
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Mick MurrayTechAuthor Commented:
This is an iPad style device even if it shipped with a DVD I couldn't run it as all I have is USB ports and the thing only has 64Gb available so I watch how much I use. I purchased and installed Driver Toolkit, when I force upgrade the EHCI driver it proceeds and then reports "Not needed (No device for update present)" The only devices requiring update are the WACOM device, and some Bluetooth components that had no effect. I should have done better with Backup & restore, but in almost 30 years of playing with PC's this is the second time I could have used them, I put nothing but legitimate software on this device, unlike previous machines, so I didn't think it was that crucial, my bad!
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McKnifeCommented:
Well, but restore points get created by default. Did you turn those off?
By the way, you can also use the setup files from USB to repair your machine. Just copy them from the DVD to the USB device and start setup.exe, select upgrade.
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Mick MurrayTechAuthor Commented:
I found a Recovery option in the "Charms" menu. I opted for the rebuild keeping my files, which took most of the day to perform, once completed it took the machine back to Win8 with the USB ports operational. I then had to perform the Win8 Updates before I was able to update it to Win8.1. Needless to say I enabled the System Protection setting (by default set to Off on this machine) and have performed a restore point before every software install. Thanks for replying, sorry it took me time to update you
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McKnifeCommented:
Good to hear that it works, although the repair from USB would have been less painful :) Now close the question.
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