id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 8347,IRQL_LESS_OR_NOT_EQUAL BSOD Windows Guest/Ubuntu Host,swoogan,,"I'm using VirtualBox 4.0.2 w/ Extension Pack on Kubuntu 10.10 64bit. I have installed both Windows 7 64-bit and Windows 2008 R2 64-bit. Both BSOD with the IRQL_LESS_OR_NOT_EQUAL error when I log in for the first time after installing. Again, these are fresh installs after upgrading from VirtualBox 3.2. No guest additions as I cannot log in. I also have a Windows 7 64-bit Guest that I installed with VirtualBox 3.2 w/ guest (3.2.12) additions. This guest runs fine in VirtualBox 4.0.2. swoogan@desktop:~$ lscpu Architecture: x86_64 CPU op-mode(s): 64-bit CPU(s): 2 Thread(s) per core: 1 Core(s) per socket: 2 CPU socket(s): 1 NUMA node(s): 1 Vendor ID: AuthenticAMD CPU family: 15 Model: 107 Stepping: 2 CPU MHz: 1000.000 Virtualization: AMD-V L1d cache: 64K L1i cache: 64K L2 cache: 512K swoogan@desktop:~$ uname -a Linux desktop 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux ",defect,closed,VMM,VirtualBox 4.0.2,obsolete,,,other,other