Notebook Memory Compatibility What Will Happen If I Upgrade From XP Home To Vista Home Basic?

What will happen if I upgrade from XP Home to Vista Home Basic? - notebook memory compatibility

My Home Basic notebook can support (eg, program compatibility "of Microsoft, as he says).

I therefore intend to update my laptop, with a removable USB device (or 4 GB flash memory USB drive or DVD).

What if I install it? It will erase everything?