Description of problem:
Everytime I'm installing or updating something, yum is doing what it has to do,
but with error.

error: Couldn't fork %post/%preun: Cannot allocate memory

Version-Release number of selected component (if applicable):
3.2.5-1

How reproducible:
Everytime

Steps to Reproduce:
1. Run yum
2. Wait
  
Actual results:
It doesn't exit with error, but doesn't install/update some packages (error with
%pre).

Expected results:
Everything working.

Additional info:

Kernel info:

[livio@castello ~]$ rpm -q kernel
kernel-2.6.22.4-65.fc7
kernel-2.6.22.5-76.fc7
[livio@castello ~]$ 

I think yum messed me in system (Fedora installed from runlevel 3 from LiveCD,
because of 128MB RAM).