Hi everyone, I have installed Centos 5.5 on Hyper-V R2 machine and all worked well. Then I installed integrated services and it did changes to kernel. This article needs to be updated, but at least it directed me into right path: http://www.howtoforge.com/installing-hyper-v-linux-integration-components-on-centos-5 then I installed "Perfect server" following this: http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-3 yum update upgraded my kernel and it seems to change kernel. after that I was not able to load server and was getting error: Code: Mounting root filesystem. mount: could not find filesystem '/dev/root' Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Booting has failed. I found this article: http://www.virtuatopia.com/index.ph...ile_or_directory_error_message"_error_message. The article above says how to fix this issue on Xen, but I'm running Hyper-V. Question: Can anyone help and give step by step guide like that but that fixes kernel on Hyper-V? Thank you.