Alternatively, try it and if gives you problems uninstall it.
You can use Programs and Features in Control Panel to remove SP1 and restore your computer to its previous state.
To uninstall SP1:
1. Click Start, and then click Control Panel.
2. Click Programs.
3. Under Programs and Features, click View installed updates.
4. On the Uninstall an update page, click Service Pack for Microsoft Windows (KB936330), and then click Uninstall.
5. Follow the instructions on your screen.