Hi all, today I upgraded from my windows 7ul. To win8pro everything went fine until I shut it down.....After 2-3 hrs. I switched my pc on its boot logo(circular loading)was extremely slow... Ithought it wasn't a big bug though , so left it..... I waited about 15 minutes it was still loading.... I turned my pc off by long pressing power button and turned it on again.... It booted successfully.... Now the problem is that whenever i turn my pc on i have to switch it off and on.... Please how can I get past this problem..... Help please!?