Simply solution: Contact with tech support of your product. I'm using Panda Platinum 2006 TruPrevent, and the problem is something related to TruPrevent which seems to detect Continuum as a dangerous program. Panda users, try to disable "Protection against unknown attacks" (I'm a spanish user, so I don't know how do they call it in english ), and reboot your comp. Try to start Continuum and voilà , it starts. I've been in touch with Panda Labs and they have just told me that with Monday's update (in my case, don't know how much will they last to send the update around the world) the problem should be fixed I'll tell you what happens on Monday. To the users of other products, again, contact with your tech support and until they don't fix the problem, annoy them with it (like me, lol, I've my gmail account plenty of panda tech support mails). PD: I've to add I'm a Windows XP user with SP2 and I'm using XP style, etc. without any special settings.