No, that is not source code.
Those are compiled binaries and the data they use.
They are also compiled for the x86 CPU architecture not MIPS (the type of CPU the PSP has).
Programmers write code that is (relatively) readable, it is then put through a special program called a compiler which turns it into a binary, which is those instructions turned into 'CPU language' if you will.
Windows is closed source, you will not get the code to port even if you had the time to do so.
It is also AMAZINGLY complex, and huge amounts of it would have to be re-written, not just re-compiled.
There is also no modchip for the PSP that allows you to add extra RAM (working memory, not storage memory like the memory stick or where the firmware is stored).
The only real possibility would be to emulate the PC hardware, and that will be REALLY slow as others have said. Completely unusable slow.
I think my first reply (post 2 of this thread) is about all that needs to be said about XP on the PSP.
