Scenario #1:
-Save/backup all your files however you can
-use a large sledge hammer to rid yourself of all the stress Microsoft has caused here
-Once all related stresses are gone, make your way to your nearest Apple store
-Spend some time with the folks there and find the right computer for you!
-Bring it home and transfer your files onto your new computer
-Enjoy easy to use, painless and stress free computing for years to come!
Scenario #2:
-Save/backup all your files however you can
-Obtain a windows OS disk (make a copy/backup of it as you will frequently need it in the future)
-Reload your laptop with new OS
-Re-install all necessary drivers and applications
-Transfer your documents back
*This will likely need to be done atleast every 1-2 years as a guideline with windows PC's*
LOLZZ apple