For some reason I get a negative value from this function on some computers. I really can not switch to another function such as GetTickCount because I have a big application which uses QueryPerformanceFrequency all over. I already tried to do QueryPerformanceFrequency(&ticksPerSecond); //freq in [counts per second] unsigned __int64 Ufreq = ticksPerSecond.QuadPart; It doesn't help... Any suggestions? I can't seem to find a solution on the web even though this problem occurs on more than one computer...And this function is quite an important one I assume... Thank you

U can try considering the value returned as hex value and proceed with normal calculations after that.