Hi trinaz
Don't worry about the system performance check it doesn't even recognise Microsofts own MSE antivirus. I've never used Bitdefender, is there an option in the program to enable/disable the system tray icon maybe it's switched off.
Sometimes it can take a couple of reboots before the system tray organises itself properly especially after running the reset.Try a couple of reboots and see if it shows.
Danny