Open TrueCrypt download page and locate the section Windows 7/Vista/XP/2000. Although not listed yet, TrueCrypt works perfectly in Windows 8 and 8.1, too.
After the small download (less than 4 megabytes) is complete, launch TrueCrypt Setup.
Click to enable the I accept the license terms option and click Next.
In the Wizard Mode dialog, select the Install option and click Next.
In the Setup Options screen, leave all items checked and click Next. This is a rare case where setup options are useful.
Next, click Install. If you want to, you can donate later from the download page, too.
After TrueCrypt has been installed, click OK.
TrueCrypt offers to open the User Guide. Click No - using TrueCrypt will be covered in the next articles here.
Finally, click Finish in the TrueCrypt Installed window.