I was thinking, ssd for OS, 1x1tb for programs and swap, 1xtb for data.
without hours and hours of diagnosis i'd have suggest a rebuild to solve issues.
what are you hdd's set up as in bios, compatible, raid or ahci?
which order did you install xp and '7 in, and did you shift the xp install from diskto disk? can you start in safe mode in step by step mode? and see what causes issues? Do you have any yellow triangles in device manager,? administrative tools - event viewer for any noted events during startup?
please don't take it to pc world...