Hey, I just mooved from WinXP to Win7 with my software. My software needs to have real time response to I/O so it makes busy-wait in one thread (wich has affinity to run on one CPU). The result is 100% CPU on one of the cores and 0 CPU for others, in WinXP it worked just fine. In win7 the system freezes. The software is a console software (for Windows program it beaves a bit diffrent. only if the main thread make busy-wait without peeking messages it freezes) Any ideas ?