i'm just guessing here but do you have a pc with the new i core chip init? if so please read this below from serao faq...
Quote:
Problems with PCs with i3, i5 or i7 processors.
Some users are encountering issue with computers featuring the newest Intel i3, i5, or i7 processors.
Users may encounter trouble successfully installing hardware drivers, or see the "Hardware disconnected' message even after installing the driver. Other users may be experiencing USB dropouts or latency issues.
We have discovered that there may be a compatibility problem between the computer's BIOS and the new controller chipset Intel uses with these processors.
Installing the latest BIOS update for your computer has been known to resolve the issue.
NOTE: This doesn't affect everyone with these processors - if you are not experiencing problems, you do not need to update.
What is a "BIOS"? Click here!
Workaround
For users encountering problems, please follow these instructions and install the latest BIOS update for your computer:
•For mobile users, this means going to the website of the manufacturer for their laptop.
•For desktop users, this requires going to the website for their machine manufacturer.
•For users who have built your own computer, see the computer's motherboard manufacturers website.
If there is no BIOS update, please contact your computer manufacturer asking for a BIOS update to resolve this issue.
Further Assistance
Please provide as much system information as possible (computer make, model, CPU details, motherboard, RAM, and any other USB devices you use).
We would also recommend users do the following basic computer tweaks:
•Always plug directly into the computer’s USB port, not a hub.
•Check that you are using a ‘good’ USB port. Try all ports until you get the best results.
•Go to your laptop manufacturer's website to check if there any driver updates for your machine.
•Switch off Bluetooth, wireless network and unplug any wired network connections.
•Switch off screen saver and set sleep mode and hard drive sleep to 'never'.
•Ensure you have ample room left on your hard drive (this is approx 10% of your hard - both internal and external).
•Close down any other software, including antivirus software or the like.
Vista and Windows 7 users follow this computer optimization guide here:
www.serato.com.
