Random "logging off"

128bit

New member
I need real help. I have Windows 7 ultimate and sometimes it seems to just "log off" when i'm doing stuff like browsing the internet or playing a game. The taskbar and my desktop items would disappear and all my programs would close and it would bring me to the welcome screen.
 

My Computer

Computer Manufacturer/Model Number
Acer aspire 5515
OS
windows 7 Ultimate
CPU
Amd Athlon 64 1.6 GHz
Memory
3GB DDR3 RAM
Graphics Card(s)
ATI Radeon x1200
Screen Resolution
1200x800
Ah come on!

does nobody else have this problem.?
 

My Computer

Computer Manufacturer/Model Number
Acer aspire 5515
OS
windows 7 Ultimate
CPU
Amd Athlon 64 1.6 GHz
Memory
3GB DDR3 RAM
Graphics Card(s)
ATI Radeon x1200
Screen Resolution
1200x800
bump
 

My Computer

Computer Manufacturer/Model Number
Acer aspire 5515
OS
windows 7 Ultimate
CPU
Amd Athlon 64 1.6 GHz
Memory
3GB DDR3 RAM
Graphics Card(s)
ATI Radeon x1200
Screen Resolution
1200x800
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