I updated my specifications.
However I did not open the case to identify the PSU, as I know little about hardware. I will try to open it with a friend of mine.
I noticed that the temperature of the graphics card is 46 degree (without any intense graphics application running). Is it hot? My friend told me this is common problem (for the pc to restart once the card becomes hot), and advised to check the graphics card fan.
The computer came with windows 7 installed; and the USB drivers
are dated 2006. However when I check for windows updates; I found no updates are required.
Another thing; I think the vendor installed card reader. From the USB definitions; can he used the usb internally for the card readers?
Thanks a lot for everyone.