1)I've got this problems for ~3 weeks
2)I'm not very common with computers nor decent in English so i might fail with answering this question but i suppose i got windows 7 final,i'll also add link for screenshot here, so if i asnwered incorrect u might check it in screenshot : http://puu.sh/2gXAI
3)Nope,i have dell vostro 3550 ,and i never updated or changed anything inside my laptop