How to restart computer?

So i have a computer and its starting to go bizarre on me i guess from downloading a bunk of junk so i need to restart it but idk how i dont have the disks that came with it but all i kno is its a Gateway computer with Windows Vista home premium and Intel and the model number is GATEWAY GT5405E i just want it the way it was when i bought it...

Update:

i meant like in a reboot way reboot it to how it was when i first bought it =.=;;;;;;

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