I tried to install h 4.51 update over 4.01 but it’s not worked. Cubase crashes, and halion alone not worked also.
It was on xp and w7 also.
For thoose who has the same problem, I solved this way the problem with uninstall halion (only the halion, not the content) and reinstalled 4.0 and then 4.5.1 right way. It’s working now again.