It should be Windows XP PRO 64 bit SP2 (or at least XP PRO 32bit SP3 if x64 is not possible), on a MAC BOOK PRO with OS X 10, using only the PARALLELS method...
The computer specs are the following:
MAC BOOK PRO (around 2 or 3 years old...) (Model 8.1 ?)
Mac OS X version 10.6.8
Processor: 2.3 GHz Intel Core i5
Memory: 4 GB 1333 MHz DDR3
Boot Rom Version: MBP91.0047.B27
This is a follow up question from this other:
Install Windows XP Pro SP3 on a MacBook Pro OS X
In this question, if possible, i would like very detailed instructions, step by step (if you consider is needed) or a good reliable link with information on how to do this installation.