However, here is a freeware tool to force Skype to activate HQ video or HD video without having a dual core processor or a Logitech camera.
Remember that, it works only Skype for Windows and if the bandwidth is too low, Skype will not send HQ video even if you activate it with this tool. You can download it free from here.
Required Windows 7, Windows Vista, Windows XP. (32 and 64bits),
Skype 3.6, 3.8, 4.0, 4.1. and Microsoft .NET 3.5 SP1