How to recover a software's architecture

Software architecture recovery is a set of methods for the extraction of architectural information from lower level representations of a software system, such as source code. What are the best methods to recover an architecture of an existing software system?

Using xampp with Windows 7 64 Bit

Xampp that I normally use for creating PHP-sites didn't worked at this computer with a 64 bit Windows 7. The Problem is that I needed it to make some changes in the source of a php-site and this with that new computer. First I had to install xampp which I did, but it didn't worked.
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