Ubuntu Desktop and Alternate CD installers crash randomly

When I try to install Ubuntu on my emachines T2792 computer (2.70 GHz Intel Celeron Processor, Intel Extreame Graphics 845GV, 768 MB DDR RAM, 80 GB Hard Drive Ultra DMA) it constantly crashes on random steps throughout the installation. I have not found any pattern. I've burned the Alternate CD twice, and checked both for integrity. Both passed. When I tried the Desktop CD, it gave me this error:

We're sorry; the installer crashed. Please file a new bug report at https://launchpad.net/distros/ubuntu/+source/ubiquity/+filebug (do not attach your details to any existing bug) and a developer will attend to the problem as soon as possible. To help the developers understand what went wrong, include the following detail in your bug report, and attach the files /var/log/syslog and /var/log/partman:

Traceback (most recent call last):
  File "/usr/bin/ubiquity", line 166, in ?
    main()
  File "/usr/bin/ubiquity", line 161, in main
    install(sys.argv[1])
  File "/usr/bin/ubiquity", line 57, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 305, in run
    self.process_step()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 856, in process_step
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 631, in progress_loop
    raise RuntimeError, ("Install failed with exit code %s; see "
RuntimeError: Install failed with exit code 139; see /var/log/syslog

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Here's what /var/log/syslog says: http://rafb.net/p/1c36HL54.txt
Here's what /var/log/partman says: http://rafb.net/p/rmMmnS52.txt
(paste.Ubuntu-nl.org wasn't working for some reason)