Chrome OS Installation Issue

[Haxker-00]

Hi there! ,i have installed chrome os step by step,but i dont know it stucks on boot screen/chrome os logo,why??

also i need to ask you i am using thinkpad w520 i7 2nd Gen Intel,8gb ram,which recovery image should i need to use,currently i have installed the rammus,but i dont know it is not working....

my friend asked me to use "samus r91".but your "r91" brunch is not working....
giving issue;
"0+0 records in
0+0 records out
0 bytes copied, 0.0009999 s, 0.0 kB/s
WARNING: Primary GPT header is invalid
WARNING: Secondary GPT header is invalid"

i have tried with r127 latest brunch but then it stucks on "Patches are being applied...."

how can i install it perfectly,without any errors,with dualboot windows??

please solve my issue as soon as possible!!!!!!