Who ever knows a lot about computers, please help me (Hlymzik...you're one of them... xD)

Recently, my computer started reseting a lot, and I don't know why, I do believe it's the virus that's causing the problem or could be that my computer has too many Spywares or rogue programs on them.

I need help, my computer usually resets when I hear my computer make a "Krrrzzzt...." sound and when it resets it goes "Pffsss...." and it's silent and when it switches on I hear "Tiiik!".

On other events like when the H.D.D (The light near the switch on button and near the "Power" light) shines bright red, then the computer resets.

Please, could anyone help me?