1, encounter such problems, the general only need to pull the U-disk plug can be;
2, if not, it is most likely you will be inserted in the U disk in the expansion of the USB slot, as long as the U disk in the main USB slot (such as the desktop chassis directly connected to the motherboard in the USB slot), you can normally install, notebook can try to replace the USB slot to solve;
3, can not be resolved, we recommend the use of hard disk installation system method
Add: With the exception of the U-disk installation win7 system, some older desktops may also have similar problems when installing, mainly because Windows 7 Setup does not recognize the IDE's physical optical drive or hard drive, Windows 7 is not integrated with the South Bridge chip driver, The IDE interface on the motherboard is provided by the South Bridge, in which case download your motherboard South Bridge or North Bridge chip driver, and then copy/extract to a U disk, in the installation time to insert a U disk added drive on it.