Don't know where to start

[Reuven]

    My system has slowly deteriorated, and I'm not sure when it started,
but now I can barely boot up.  

During both shut down and start up the system often freezes after I get
screens full of what looks like memory addresses.
As far as startup goes, the freezing seems to occur at random
places--always at a different point in process.

Here are the files in /boot:
-rw-r--r-- 1 root root   63259 Dec 20 14:03 config-2.6.18-1.2869.fc6
-rw-r--r-- 1 root root   66770 Jan 10 18:02 config-2.6.19-1.2895.fc6
drwxr-xr-x 2 root root    4096 Jan 19 11:25 grub
-rw------- 1 root root 1552461 Jan  3 04:57 initrd-2.6.18-1.2869.fc6.img
-rw------- 1 root root 1559754 Jan 19 11:25 initrd-2.6.19-1.2895.fc6.img
-rw-r--r-- 1 root root   95650 Dec 20 14:03 symvers-2.6.18-1.2869.fc6.gz
-rw-r--r-- 1 root root   98762 Jan 10 18:03 symvers-2.6.19-1.2895.fc6.gz
-rw-r--r-- 1 root root 1123981 Dec 20 14:03 System.map-2.6.18-1.2869.fc6
-rw-r--r-- 1 root root 1163558 Jan 10 18:02 System.map-2.6.19-1.2895.fc6
-rw-r--r-- 1 root root 1979654 Dec 20 14:03 vmlinuz-2.6.18-1.2869.fc6
-rw-r--r-- 1 root root 2143133 Jan 10 18:02 vmlinuz-2.6.19-1.2895.fc6

I'm using:
Xfce 4 Desktop Environment
version 4.4.0 (Xfce 4.4)

In the beginning (4 months ago) I started with gnome, then tried Xface
and KDE.  I liked KDE, so was using it, but it really went wacko the
last few weeks, so Xface seems to work better.


When I do get booted up these problems happen regularly:

      * Firefox will work for a while--sometimes not at all, then will
        just shut down. If I try to start it again, I get a message
        "cannot start browser"  
      * Software updater Freezes up and then I cannot close it, even
        with task manager
      * If I try to Add/Remove Software it usually closes down when I
        hit apply
      * When I try yum update in a terminal window.  I get segmentation
        error.  Also mono-core has a missing dependency.
      * There are other updates which have for a while not updated
        either because "no mirror found", or because of missing
        dependency
      * Sometimes when I select quit from Xface menu I get message that
        i cannot quit, so i have to do it from a terminal window.

I noticed that the main partition I use for Linux is mostly full.  I
tried to use gparted to increase the size of the partition. I made room
to make ti bigger, but since it is the active partition I can;t touch
it. How can I do this?

Please cc me on reply, Thank you,

Reuven