Now listen. First make sure that all the hardware is compatible for both. Beleive me it does. So when its doen, make sure you have at least and I mean It, 4GB of RAM and more if you can. Processor is fine. I hope your not talking about a laptop, cause you will never get good result with external drive. If you have a desktop than buy one large enough to hold both OS, no need to put it on 2 different drive it will do just the same. The second hard drive take the largest and fastest one if possible, so all the program and data will fit well enough. Install windows first. Make sure you don't use FAT as the format of the disk but NTFS. Finish all the installation of XP with all its driver. To make sure go click on start, then Control Panel, find the icon named System, open it, go to hardware tab an click it then into Device Manager. You'll see all the hardware that hold your computer and all that are in yellow or red means the driver is wrong so use the driver that came with you hardware or find it on the internet or ask you vendor. If they sell the product they have to have the driver for it. when all the hardware driver are ok, then, both with your vista disk and install it. Windows will know what to do if you install it in a different directory, that you'll called Vista. From this moment the new OS Vista will be a dual booth on your coputer. Make sure all the correect driver are again all without error. You will see will doing the installation that when the computer reboot you'll have two possibilities XP or Vista. Now this is very important. On the second drive make sure that you put a different directory for Program Files for Vista. The program you will install with XP made it "Program Files" and for Vista "Vista Program Files". Remember you can not put a program installed by XP in the same place as Vista cause you will get mixtup. So you will know who bare the program for XP and Vista. Cause when its installed with XP its not sure you will be able to install over and make it work agin with Vista, they don't use the same way of using programs. So vie versa.
If any confusion or need help somewhere Tell me.
OH! remember when using internet, with the Ethernet card don't communicate with your modem, just "RENEW IP" or rest the modem that maybe the only problem.
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