Been there, did that. Most of laptops with Windows will have an option of creating recovery disk Start/Programs/Recovery manager/Recovery disk creation. You will need 2-3 empty DVD-Rs for that. When you have the disk, put it in the DVD drive on boot-up and follow prompts. Easy! Hurry while your system still works and you are able to make the disk. If it crashes restoration process depends on some variables and becomes a lottery.
P.S. The laptop end up in 'like new' state - so make sure you backup all your data and have all distributives.
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