FreeBSD installation problem

[mikael.karlsson at saunalahti.fi]

I've tried to install FreeBSD 4.8 Stable on my computer about 5 times 
but every damn time I get an error when the installation reaches the 
dependence install. I get an error messages saying something "... error 
code -1 Please check the debug screen for more info". When I press 
ALT+F2 I see a screen saying something like "gzip ... crc error".

But the thing is that the package that sysinstall stops on isn't always 
the same but mostly on XFree86 packages. I've tried installing from CD 
and four diffrent ftp mirrors but it's the same.

I tried everything I can think of to solve the problem but nothing works 
it's always the same!!