According to that service tag number:
You have
this Dell Inspiron 15R 5537 laptop
According to its system configuration section, it came with:
Intel Core i7-4500U 1.80 GHz dual core processor (4th generation)
Intel HD Graphics 4400 integrated graphics
Intel Dual Band Wireless-AC 7260 wireless
The above described processor, graphics device, and wireless device do not support Windows XP, so you will run into installation and driver issues.
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Now to the problem of trying to install Windows XP in triple boot mode in a laptop which already has Windows Vista and Windows 7 installed.
To do it properly, you need to install those 3 operating systems in order by oldest to newest:
Windows XP first
Windows Vista second
Windows 7 third
If you fail to do that and you install Windows XP third, you will be unable to use Windows Vista and Windows 7.
My advice is to leave things as they are.
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