crc error???
 

so I burned Kubuntu and it worked fine
when it booted I got the menu and I choosed Start steup
I got Loading Linux Kernal and then
crc error
system halted

I got the same when I tried low graphics and check defects
(I got error=1)

whats the problem?

Did you burn at a low speed?
Which version of Kubuntu? Live CD or alternate CD?
Further you can run memtest for a while to check if you have a memory problem.