Install world fails, computer almost unusable

[Andy Rozman (Aleksander)]

Hi !

I succesfully compiled FreeBSD 5.2.1, but problem happened when I wanted to do
install. After I run installworld install started but halted at one point
(with copying ld-so.1 in libexec). I found 
ld-so.1.old file which I removed, and after I run installworld again, mtree
failed with core dump, and "Bad Syscall"...

Now I can't do anything. Most of system programs now do core dump. 

Is there a way to solve this?

Andy