sir, try to change your data cable from external to PC/laptop baka kasi may sira or maluwag ung saksakan.. try mo din po sa ibang USB port, kung ganun parin try to scan disk your external drive.
trying to help
usually ganyan ang sira ng HP Pavilion laptops..
ask ko lang, yan ba ang orig. OS nyan nung binili mo?
kelan po sya nag start mag shutdown?
and last.. na try mo na po ba mag safe mode?
laggy and chappy laptop sa gnyan specs? na try mo nba mag win7 Ulti?
kung nag rereformat ka several times..in fresh start laggy parin kahit wala pang naka install na apps.?
Hmm. kung bagong bili, may software warranty po ba? Baka pwede mo pa pong i reklamo or kung ayaw mo na mag pagod try to reformat then change your OS to win7 ultimate.
pwede naman po nating gawing router ang laptop naten kahit walang tools or etc.. setup lang po kayo ng wireless ad hoc from your NETWORK AND SHARING CENTER sa control panel then network and internet.
drivers po siguro kulang senyo. try to search here in symbianize Genius drivers or Drivers..