Can no longer install drivers and touch screen not working anymore

I have the HP 520-1130ea all in one PC. Its a touchscreen. I have Windows 7 home premiun 64 bit operating system.
it has been working fine for the last two years and on Friday 11th april, i connected my android tablet (samsung Galaxy tab 7.0) to my pc and it could not install the drivers so my PC could not see the tablet.  Last week this worked ok. I attach my tablet to my pc using a USB cable and transfer files by usb transfer. I dont use any software at all.
I have tried to reinstall the drivers for the android tablet and i get the error code that the drivers were found but they cant be installed. Access denied.
I have also tried to restore my pc to the last time everything worked ok which was just a week before the problem started, but the restore has failed on 4 occassions.
I have now deleted all updates on my PC from last week and i think I have deleted something or failed to allow something to isntall (a box popped up when i restarted the computer after the update delete which I ignored)
No my touch screen no longer works.
I plugged in an external hard drive to back up my computer and I also could not install the drivers for that too. this just happened today.
My printer is connected to my PC and that still works ok.
I have been battling with this for 4 days now and ploughed the internet for solutions and no hope in sight!
I have also tried:
1. installing optional updates. no luck there. also some of the updates failed
2. giving myself full control on the system 32 folder in windows.
I am the administrator on the PC.
HELP PLS!!!

Hi compnewbie,
Welcome to the HP Forums!
Thank you very much for your thorough post and detailed steps! I see that you are not being able to install drivers, and I would be happy to assist you!
The first suggestion I will make is to boot your computer in Safe Mode. To do this, please follow this document on Windows 7 Safe Mode. No extra software will be loaded, which will make this driver issue easier to troubleshoot. In Safe Mode, try to connect your external drive.
If you still cannot connect your external drive (or any other USB device), I recommend following this resource on Testing for Hardware Failures (Windows 7). This should help diagnose any potential hardware problems with the computer.
If you are not able to detect any hardware problems on your computer, please follow this document on Restore files from a backup.
Please re-post with the results of your troubleshooting, and I will diligently follow up with you!
Best regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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