HELP - Latest Win7 update has reduced my internet speed by 70%!

[System]

HiMy system was working fine on Friday 26th March, the system then updated and on Monday 29th March my internet speed was very erratic about 70% slower than normal.I have Virgin 60MB fiber optic which is running fine on all my other devices.This desktop in connected to the network via Solwise powerline LAN.I tried to do a system restore to before the update, however this caused even worse system issues, I therefore reinstalled windows and then I recovered just my files from a backup, the system worked fine again, but then windows updated again and I'm back to
the same slow internet issue.Can I uninstall the latest update that is causing this issue? I've looked in 'Installed Updates' but because all the updates were installed today I can't tell which is the latest from the instal date, if I knew the update name then maybe I could uninstall it and solve the problem...Help?Otherwise I will have to do another fresh software install which will take ages and then turn off auto updates which may leave me with vulnerabilities...

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