windows 8.1 hdd at 100% at startup

[alyoob]

When i boot my computer the hdd is being utilized 100% for 3-4 miunutes and i tried uninstalled avast and checked hdd usage but that did not work uninstalled malwarebytes and still same. what processes are causing the high cpu usage. i5 haswell 3.0 ghz 8 gb ram nvida gt ge force 630. By the way i scanned my computer with avast, malwarebyes, superantispwate and hitman pro and nothing was found.

[Allan]

There's really no such thing as 100% disc usage - did you mean cpu usage???. Assuming  you mean the hd is active for the first few minutes after boot it's probably Superfetch and / or System Restore (creating a restore point).

[SuperDave]

Please give this a try and see if it makes a difference. It is normal for your computer to be busy when you first start because a lot of programs are trying to get updated.

StartupLite

Download StartupLite by MalwareBytes to your Desktop.
Doubleclick StartupLite.exe to launch the program.
Ensure the Disable box is checked.
Click Continue.
A pop up message will tell you the unecessary startup items in your list have been disabled and ask you to restart your computer.
Re-start your computer.