Just a word of warning, there is a Beta version of Windows 7 SP1 floating around on the net. People have been installing it on their systems not realising it is still Beta. This means it expires 30 days after you have installed it, meaning your once fully working machine will work no more. You will have to re-install Windows 7.
Please wait until Microsoft release the SP1 on Windows Update. Do NOT Install.
More Info: Windows 7 SP1 (Service Pack 1) Beta Leaked
