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The Main VirtualBox menu
Here, you click on the New icon and you then select the operating system you want to install. In our case, that's Windows XP. Give it a name, XP for example, and then hit the next button.
Setting the XP VM's memory
This will bring you to the memory-size window. In theory you could run XP with as little as 192MBs. Let's not be silly. I prefer to give XP at least 1GB of RAM. Since my test system has 8GBs, I elected to give XP 2GBs to play with. If you're converting an old XP box to Linux service, you probably won't be fortunate enough to be able to give it that much memory.
Picking out a virtual drive
Next, you're given a choice of whether to use a new virtual hard drive or use an existing one . Unless you're updating an older XP VM, you're always going to want to create a new drive.