Some Device Drivers not loading at Startup

For the past several weeks, whenever I initially boot my Dell Inspiron laptop
running Win 7 Home Premium, my Microsoft wireless mouse will not function.

However, if I use Task Manager to 'Restart', the mouse operates normally.

Looking at the Boot log file, there are a number of Device Driver files that
are not run during the initial start but are run during the restart. These are
not 'Driver Not Loaded' cases but drivers not even attempted to load.

Is there some logical reason more drivers are loaded during the second start than
during the first? Is there some setting adjustment that will allow all the
drivers to run/load on the initial startup?

During initial start, this gets loaded:
Loaded driver \SystemRoot\System32\Drivers\RtsUStor.sys

During restart, that does not even appear on the the boot log list but these [not on the initial] do:
Loaded driver \SystemRoot\system32\DRIVERS\nusb3xhc.sys
Loaded driver \SystemRoot\system32\DRIVERS\nusb3hub.sys
Loaded driver \SystemRoot\system32\DRIVERS\dc3d.sys
Loaded driver \SystemRoot\system32\DRIVERS\usbscan.sys
Loaded driver \SystemRoot\system32\DRIVERS\hidusb.sys
Loaded driver \SystemRoot\system32\DRIVERS\kbdhid.sys
Loaded driver \SystemRoot\system32\DRIVERS\mouhid.sys
Loaded driver \SystemRoot\system32\DRIVERS\asyncmac.sys
Loaded driver \SystemRoot\system32\drivers\WudfPf.sys
Loaded driver \SystemRoot\system32\DRIVERS\cdfs.sys
Loaded driver \SystemRoot\system32\DRIVERS\WinUsb.sys
Loaded driver \SystemRoot\system32\DRIVERS\WUDFRd.sys
Loaded driver \SystemRoot\system32\DRIVERS\udfs.sys

Also not sure why the word 'Drivers' is capitalized on second run and not the first. The actual folder name is not capitalized.