cambdi

I have an old Packard Bell PC running windows XP, it shut down once during the day last week and I thought I'd knocked a wire out or something. Now I'm only able to use it for approximately 8 minutes before the screen goes blank and it shuts down although it appears to be still running. I've not knowingly downloaded anything, I run the free version of AVG. I don't know if that's enough information or whether I've posted in the right place but I need some advice please. Cambdi

Hi, I've not been on a forum before. I don't know where I'm supposed to post my issue and too scared to write it in the wrong place & be struck off! Cambdi:confused: