The Add or Remove Programs section in the Control Panel on Windows XP shows the same file size for Vivado, DocNav and Xilinx Information Centre.
See the screenshot below:
The sizes listed are incorrect for Xilinx DocNav and Xilinx Information Center (XiC).
This is a visual issue only and is considered obsoleted with the Vivado 2014.3 release.
Windows XP is not supported for Vivado 2014.3.