I've suggested a few things in this thread to help you but I'm not sure if you've tried any of them yet.
You need to remove the variables and complexity here to make this easier to diagnose. Try another drive. Try another system version, 7.5.5 has been recommended and I sent you a link of where to get it.
Having two systems on one disk may not be helping - it sounds like there may be corruption or conflicts. Start over with just one OS to start with, on a known reliable disk. It sounds like your old drive may not be reliable and could be causing some of the errors?
You need to remove the variables and complexity here to make this easier to diagnose. Try another drive. Try another system version, 7.5.5 has been recommended and I sent you a link of where to get it.
Having two systems on one disk may not be helping - it sounds like there may be corruption or conflicts. Start over with just one OS to start with, on a known reliable disk. It sounds like your old drive may not be reliable and could be causing some of the errors?