To install Easybcd on XP, you need to first download and install .NET Framework 2.0 from MS
Download details: .NET Framework Version 2.0 Redistributable Package (x86)
D/L and install Easybcd
Download EasyBCD 1.7.2 - NeoSmart Technologies
A. Click Manage Bootloader
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B. Make sure "Reinstall Vista Bootloader" is selected, Click Write MBR
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C. Select Add/Remove Entries
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D. Select Windows NT/2k/XP/2k3 in Drop-down, Click Add Entry, Click Save
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Don't worry it says Vista - NT6 compatible MBR is the same for Vista and 7.
You could do it with command line instead , if you are familiar with that.