How to re format a laptop with an encrypted ssd. I just want to reload win 7 64 bit?

I bought a car at an auction and inside was a Lenovo thinkpad x220. The hard drive is a solid state drive with a Symantec desktop encrypted username and pass phrase. I want to format the drive and use the computer

You will need a legitmate version of windows ( cd/dvd ) you will need to boot up ( have the cd/dvd in the cd/dvd drive upon boot up ) with that cd/dvd and then upon the options select refornat/ reinstall the operating system…