You did a clean install ... then what ?
1. Stop windows from installing hardware drivers
http://www.sevenforums.com/drivers/82054-turn-off-windows-7-automatic-driver-installation.html
2. Set Windows to "Check for Updates but let me choose when to install them"
3. Install hardware drivers / desired utilities from original media that came in the box w/ your hardware components.
4. Run Windows Update the 17 or whatever times it needs to run till it finishes and says no more left
5. Visit the manufacturer's web sites for all your hardware components and install latest drivers.
Optional:
-If you want to avoid Windows 10 stuff being installed, install GWX Control Panel after Step 3.
-If you want to prevent any of the Windows 10 tracking stuff from being installed on Win 7 / 8 then avoid any of the telemetry related updates. Yell if ya want a list of KBs to avoid.
If you are using an AV program, it may be doing a full system scan.