Check and make sure all plugs are securely fastened.
Plug in any loose plugs. A loose plug can easily cause external noise.
Check the ground. This can also be caused by a laptop with a poor ground. If the laptop has a problem with the ground, that can cause a major humming noise. The ground will either need to be removed or an isolator will need to be added.
Check the USB ports. Some computers may occasionally have problems with USB ports.
Free up space on the USB. If two devices, like an external sound card and external hard drive, are used at the same time, there may not be enough bandwidth for both devices. When the USB ports do not have enough free bandwidth, audiovisual information cannot be transmitted quickly enough into the program, causing freezing or pausing.
Unplug one of the devices or copy the files onto an internal hard drive to fix the problem of freezing or pausing.
Don't run video. Integrated video cards, often found on laptops, are not powerful enough to use with video in Virtual DJ.
Use lower-resolution video.
Purchase a dedicated video card from manufacturers such as NVIDIA or ATI. Make sure the card has dedicated video RAM.