That error message tells you that you have more than one partition on your hard disk, so you have to delete it before running Boot Camp.
1. First of all, if you have important data on that volume, copy it to the first partition before doing anything. You can access to that volume on Finder sidebar.
2. Open Disk Utility, select your hard disk at the top of the sidebar and go to Partition tab.
3. You will see a partitions bar with all the partitions of your hard disk. Select the last partition and press - button to delete it.
4. Then, click at the bottom right corner of the first volume and drag it to the end of the bar, so your OS X partition will use all the space of the hard disk. Finally, press Apply.
5. Close Disk Utility, open Boot Camp Assistant and follow the steps to install Windows.
I give you some notes for the Windows installation:
- Boot Camp will create a FAT partition; however, Windows Vista and Windows 7 requires a NTFS partition, so on the partitioning screen (it will appear during the Windows installation), you have to select "BOOTCAMP" volume, press "Options" and choose "Format". When it finishes, press "Next" and Windows installation will start.
- After installing Windows, you have to install the Boot Camp drivers. Just insert the Snow Leopard DVD and follow the steps to install the drivers. They will give compatibility for all the hardware of your Mac, so you won't have any problem with Windows.
- After installing Windows, your Mac will always start into Windows by default. If you want to start into OS X, press X key while your Mac is starting. If you want to start always into OS X, press X key while your Mac is starting, open System Preferences > Startup Disk, and choose "Macintosh HD".
- If you do this last step, to start into Windows, you only have to press Option key while your Mac is starting and choose "Windows".
If you want all the detailed steps to install Windows, you can print this PDF > http://manuals.info.apple.com/en_US/Boot_Camp_Install-Setup_10.6.pdf
That's strange. In this case, make a backup of your data with Carbon Copy Cloner and reinstall OS X.
1. Insert the Snow Leopard disc and press C key while your Mac is starting.
2. Go to Utilities > Disk Utility, select the hard disk at the top of the sidebar and go to Partition tab.
3. Select "Macintosh HD" and press - button to delete the partition.
4. Press + button and you will see a partition that will use all the space of the hard disk. You can name it "Macintosh HD", and choose "Mac OS Extended (Journaled)" as Format, and press Apply.
5. Connect the external disk with the backup to your Mac, select Macintosh HD in the sidebar and go to Restore tab.
6. Drag the external disk to "Destination" box and press Restore. When it finishes, restart the Mac and try to use Boot Camp Assistant
I've downloaded Carbon Copy Cloner and am ready to make a backup of my data.
It asks me to select a source, and I selected "Macintosh HD" (with all the folders in Mac HD selected), and then it asks me to make a desitanation for the source (I pasted the scrolldown menu for Source and Filters in the picture...).
I'm not really sure what to select. I'm sorry for being such a hassle!
I don't think there's enough room on my computer to copy everything.
as mende1 says, you need an 'external HD' to accomplish what you want to do...
Since you have about 162GB on your Mac partition now, by formating you would loose all the items you have there (beyond loosing your OS which you can easily re-install).
And your remaining free space on your HD (88GB) is too small to back-up your existing HD to.
(Plus it wouldn't help you since you have to wipe THAT HD clean).