Currently Being ModeratedFeb 6, 2013 8:51 AM (in response to Decrepify)
It's simple. If you have downloaded Windows support software, probably Boot Camp Assistant asked you before downloading it where to store them (on a DVD or USB drive), so you just have to insert the USB drive or DVD with Windows support software, start into Windows and install the Boot Camp drivers.
You should see a window asking you what to do with the DVD or USB drive after inserting it on Windows, so select the option to open the .exe files and follow the steps to install Windows support software. If not, open Windows Explorer or go to Start menu > Computer, and right-click the DVD or USB drive with Windows support software to install it