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When I switch on computer it starts and in 10 - 15 seconds it turning off.

Solution

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First of all check your power switch. If it does not come back after you push it, this might happen. Pushing and holding power button more than 10 or 15 seconds turns off the computer suddenly.

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Check your CPU fan is working. Sometimes wires inside System Box may go through the fan and interrupts the rotation of the fan and stops. In this case the computer stops working to prevent damaging to the CPU due to heat.

When I'm going to insert characters between words it replaces the existing characters.

Solution

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This may happens you have accidentally pressed 'Insert' key on the keyboard. Pressing 'Insert key' again will solve this problem.

When I double click on any of my hard disk partitions, opens autorun dialog box.

Solution

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Your computer infected with a virus. These kind of viruses usually comes from Pen drives. Please read our topic "How to use Pen drives" to prevent virus attacks from pen. To remove this virus install a virus guard (We recommend Kaspersky) and clean the virus.