If I switch to a text terminal (Ctrl+Alt+F?), it keeps saying something about giwscan about every minute, sometimes right in the middle of my typing.

Also, after some updates installed a long time ago, the computer started to boot very, very slowly.

Third, whenever updates include a new kernel, it screws up the computer and I have to set it to use the original one again.

What do you think could be the problems?