Try going to your start button, then looking in Startup, if it's there, delete it.
If not you may have to have a look in MSCONFIG, in the Startup tab. Untick it.
Do you have windows opening on startup, other than Explorer??
AMD Radeon Adrenalin release date, new features, compatible graphics cards
Indie publisher Canongate’s top 10 book covers of 2017
New iMac Pro release date, UK price & specs rumours
Tablettes Amazon Fire : quel modèle choisir ?