There is problem in my windows 7 compatible Acer notebook, whenever I tried to close any program or application. The machine is specified with 3GB RAM, 320 GB hard drive, along with this Intel dual core processor and Ati Radeon graphical interface. The problem is start occurring after upgrade my machine from vista top windows 7. Whenever I tried to close any program, after completion its task, it flashes a message that, this program is using by other program, I checked in the background, but did not found any thing. So I am here, is there anyone having any suggestion for me to resolve this issue.