Howdy, I have 2 identical machines. They are HP machines with quad-core CPU's, 8 GB of RAM, 1 TB drive partitioned into the primary (100G) and data drives (840ishG) I have Windows 7 Ultimate installed on the machines. They work great until you bring them back from "sleep mode". The crash file is as follows: Problem signature: Problem Event Name: BlueScreen OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 1033 Additional information about the problem: BCCode: f4 BCP1: 0000000000000003 BCP2: FFFFFA8007ABFB30 BCP3: FFFFFA8007ABFE10 BCP4: FFFFF80002BD4540 OS Version: 6_1_7600 Service Pack: 0_0 Product: 256_1 Attached are the dump files from one of the machines. Any help would be greatly appreciated.