I can't download the Adobe Flash 13.

Adobe Flash was downloaded 48% at the first and 50% at the second time, it were interrupped by Safari which was opened. Installer said "Please close Safari" I guess the Safari has been opened in the background or by soemone. I guess. I don't know what is going on. Please give me the help. I will appreciate that. When I pay my bill online at ATT website, the message will pop up " Please close your private browser". Please give me some advices, so it makes my Safari safe.

Recently, I need to change my email accounts' password a lot because I sign in even I mark into my note book. I am sad about that. Help and Help.