Whenever i start my computer when it starts normally but when i input my password it takes a long time to start windows and when it does start the screen stays black for up to 45 minutes(or it just stays black and i need to restart). Then every action takes like 30 times as long till i do them a few times. The the computer start to run in a normal way(seemingly at least). The internet stops responding more often leaving me wait for a while every few minutes unless i just sit and watch something online. My memory has 5.8Gb usable space of 6Gb and my harddrive has 6Gb space free of like 6.7Gb so i don't think it is an issue of space. I don't know if it a virus or something on my computer that is glitch please someone tell me you can help me.