make sure that your source is ORIGINAL SP3 100% and not some image that you think may be "real" or "clean"
......WIC is included with SP3 and so is MSXML6.
I've tried to installer it manually the .Net Framework 4.0 manually.. and successfully installed it without any problems at all.. Client profile and extended..
maybe your .net framework update doesn't match on my Windows XP Pro SP3..