Hi Frederic, and welcome to Wilderssecurity! I've been running LnS on my Win XP system for a month or two, and it's been behaving impeccably most of the time. However, on two occasions I've been getting "LnS has encountered a problem and needs to close" Details reveal a LnS page fault in Looknstop.exe. When that happens, after relaunching LnS all registry settings apear to be wiped out: Registration info is gone, the Application Window is empty, previous Window size isn't retained any more, etcetera. Any idea what could cause this to happen?