Microsoft Windows XP Professional "megabyte mean" Questions

my problem is window xp already install in my computer.i want reinstall in my computer.how do this? First, locate the Windows CD that shipped with your PC, along with the CDs for your application ...

...gigabytes? Mega mean million - Giga means billion. Thus megabytes are less than gigabytes. To make a megabyte value read as gigabytes, move the decimal point 3 places to the left. Thus: 1.8Mb = ...