dual booting

You have the OS installed on a removeable HD, so when the computer starts up hit the f10 goto bois and select boot options and set the options HD1 HD2, USB what ever connection you are using.

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right-click my computer>properties>Advanced Tab>startup & recovery settings button.

make sure "time to display OS" is checked and select the amount of seconds you want to display message.

If you really feel daring you can edit the stratup options manually (click edit button)

AT YOUR OWN RISK!!

Just another way to get your screen...
open My computer > "tools" > Folder Options > View tab > click "show hidden files and folders" & "Hide Protected operating system files". Then open C:\ and you will see Boot.ini in here, it will be some what transparent... but open it and add
multi(0)disk(1)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
**0 = 1, and 1 = 2 when referring to disk and partition locations...
Do not delete the first entry!!!

then go to "Start" > run command > msconfig > 4th tab > then you can click "Check boot paths... if its correct which it may not be, you will have to edit the boot.ini till you get the correct location.... just don't touch the first entry, or you will not be able to boot!!