I too have the same problem. However, I have ACPI disabled and APM enabled on two laptops and both exhibit the same problem during heavy CPU and /or memory usage. I am using Xircom pcmcia NICs in both. According to Device Manager, No IRQs are being shared. I am still puzzled as to the exact cause of this problem which consistently manifests itself while using either WinAmp (several versions) or eDonkey.