I was trying to upgrade my system from Windows Vista to Windows 7 and I have got the following error. "There is not enough free space to store temporary Windows installation files. Try using Disk Cleanup, uninstall old programs, or move files to an external location such as a CD, DVD, or external hard drive." But there are about 225 GBs of free space. Can you guys direct me that where my machine could have problem due to which I am getting such faulty errors?