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So you can check your copy is not damaged or trojaned, here are some XP CD ISO SHA1/MD5 hashes I found:

Windows XP Professional with Service Pack 3 (x86) Retail CD (English)
Filename: en_windows_xp_professional_with_service_pack_3_x86_cd_x14-80428.iso
Size: 589.14 MB
MD5: F424A52153E6E5ED4C0D44235CF545D5
SHA1: 1c735b38931bf57fb14ebd9a9ba253ceb443d459

Windows XP Professional with Service Pack 3 (x86) VL CD (English)
Filename: en_windows_xp_professional_with_service_pack_3_x86_cd_vl_x14-73974.iso
Size: 589.14 MB
MD5: 5BF476E2FC445B8D06B3C2A6091FE3AA
SHA1: 66ac289ae27724c5ae17139227cbe78c01eefe40

Windows XP Home with Service Pack 3 (x86) Retail CD (English)
Filename: en_windows_xp_home_with_service_pack_3_x86_cd_x14-92413.iso
Size: 564.72 MB
SHA1: 5a6b959ad24d15dc7ebd85e501b83d105d1b37c6

Windows XP Professional with Service Pack 3 (x86) Retail DVD (Japanese)
Filename: ja_windows_xp_professional_with_service_pack_3_x86_dvd_x14-80464.iso
Size: 630.21 MB
SHA1: 3125aaed8f40a5d8a10dbb959a03e39acc0d9fcb

Windows XP Professional with Service Pack 3 (x86) VL DVD (Japanese)
Filename: ja_windows_xp_professional_with_service_pack_3_x86_dvd_vl_x14-74058.iso
Size: 630.21 MB
SHA1: 8719219c7a77756a904f4bb9fd2f32781f091c22

Windows XP Home with Service Pack 3 (x86) Retail CD (Japanese)
Filename: ja_windows_xp_home_with_service_pack_3_x86_cd_x14-92421.iso
Size: 608.73 MB
SHA1: a907477482a45f0c7617e384b1b8a69802bc815c