I understood from what you originally said that you may have to uninstall. I should have asked, "Why do you think so?". Instead I asked if you had read this in the documents. Hence my use of the word "hint".
Ok, thank You for info, english isn't intuitive for me.
I have asked about uninstall because I hope that meybe this is able to resolve (by the way) problem of disappering folders in PlugIn Manger or track headers. Nothing indicates that SCS had worked with this category of problems (annoying but not urgent).
I have seen in knowledge base section procedure about reinstall Vegas. It takes a lot of time and I'm not going to perform this just to achieve the same situation with disappearing folder as I have in this moment.
But it's temptation to unistall, then install new instances and plugins, then export PlugIn Manger KEY from registry. It could be "one click solution" to restore PlugIn Manger folders structure (via import registry KEY).