My pc hp dc7700 turn off suddenly every time i am working on it plz.is there any one to help me???

Software best guess-
-you have gotten a virus that is affecting your system files.
-your system files have been damaged.
do a good scan with some virus protection and remove the viruses
- if it shows viruses affecting system files-and that virus cannot be removed by any regular virus protection.
try watching a few combo fix tutorials-last resort for a malicious unmovable virus.
hardware best guess-
sounds like an overheating issue try buying a good case fan.
if that does not work try removing your heat sink from your processor wiping both clean of paste or residue and re applying thermal paste. my favorite type is arctic silver

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/tyler_d7f5052aae55714c