I created an application in vb. It contains a code that copies a file from one location to another location. When the software starts to copy the file the software turns white when performing the loop in windows xp only. But actually the software and the loop is performing well. After the loop is over the software interface returns back. This happens when some long loop is working in the software. When i try to click the software when it turns white, the caption of the window comes as not resonnding, but after it coes out of the loop everything turns normal. How to stop the software turning white. Please help me in this.