- Windows XP with Service Pack 3 x86 retail symbols, all languages (File size: 209 MB – Most customers want this package.)
- Windows XP with Service Pack 3 x86 checked symbols, all languages (File size: 202 MB)
Quoted from here.
What’s the difference between retail symbols and checked symbols?
In general, the difference between “retail” and “checked” is similar to a “release” versus “debug” build. Microsoft provides two different kernels, one compiled for regular use and one with extra debug information. The two different builds also have two different symbol tables.