err 507 means all your data is gone, so i hope you have a recent backup.
not sure why your software keeps having problems with installation, but here is what you can do to help / fix it:
1) uninstall all the software packages you have on there now
2) re download (and maekke sure its complete / uncorrupted) the OS package
3) install said package
4)launch loader.exe from the commandline with the /nojvm argument
that shoudl get you back on your feet.
--- Siggie ---