Housewife.
You didn't mention the laptop's make model etc. Many of the manufacturers build their machines with a "Recovery Partition" on the hard drive.
Accessing it varies with each maker. If it's a newer DELL, you might see a blue "banner" across the top of the screen when you boot it with
www.dell.com in it. You would simply hit the Alt + F11 key combo I believe which will initiate a complete rebuild. BUT BE CAREFUL - you need to back up your data first because the process involves a disk format. Once it's done - you'll have the PC or Laptop set to factory install.
Other companies like HP, Acer, ASUS etc may include a Recovery Disk Maker which will allow you to make the recovery set yourself ( need a number of CDs or DVDs - which the system will tell you )
They all do it today - just each manufacturer does it slightly different.
The advantage of this is that the Recovery Process includes all the drivers and software needed for that model - all you do after it's rebuilt is perform the updates to get it current.
Let's us know which laptop you have before you try to downloading a 200-300 meg ISO you need to burn anyway.