Cannot boot live cd, various errors(sometimes kernel panic, sometimes it goes to busybox)

I want to install Ubuntu 10.04.2 on laptop, but first time I run Ubuntu live CD it runs perfect, but when a rebooted the live CD don't want to boot anymore. Live CD sometimes gives kernel panic(Kernel panic - not syncing attempted to kill init!), sometimes it goes to busybox. I also tried with acpi=off option, but still kernel panics or dropping to busybox. Live CD is ok, because I already installed Ubuntu on some computer from the same CD.

I tried with Ubuntu 11.04 live CD, but this version also gives kernel panics.

I also tested memory with memtest and computer past the test without errors.

Because the laptot have only 512 MB of RAM I tried to install Lubuntu 10.04, but when I boot Lubuntu from live CD it gives me kernel panic((process:289): GLib-WARNING **: getpwuid_r(): failed due to unknown user id (0), Num Lock light is blinking)

I sometimes get errors like Authentication failure, Input/Output error or

SQUASHFS error: Unable to read data cache entry [c4d70c8]

SQUASHFS error: Unable to read page, block c4d70c8, size e046

The laptop is Acer Aspire 5100 and it has:

• AMD Turion 64 (2.0 GHz, 512KB L2 cache)
• ATI Mobility Radeon X1300 128MB
• 60GB PATA HDD
• 512MB DDR2
• other things, like WLAN, bluetooth and so on

This laptop have Windows XP installed, but they are slow as hell(so slow, that they are impossible for normal use), so I want to install Ubuntu or Lubuntu, but it gives me various errors, while I am attempting to at least run live CD. Should I try with live USB?

Any help is appreciated. :)

UPDATE: I also tried Fedora 15(with Gnome shell) right now and it boots. Why the hell Ubuntu don't want to boot?

UPDATE2: It looks like the Ubuntu 10.04.2, Ubuntu 11.04 and Lubuntu 10.04 CDs are damagaed, acording to CD files check. But before I used this CDs on various computers, they just works. There must be something wrong with DVD-ROM on this laptop, because those CDs were OK before I tried it on this laptop. I am now downloading Ubuntu 10.04.2 iso image and I will make a liveUSB and then I will post results.