What is the method of temporarily turning off Lavasoft Personal Firewall?
I tried to turn it off for an experiment by right-clicking the firewalls system-tray icon and selecting "suspend protection..." -- but I don't think that completely shut the firewall down.
I wanted to see if the above-mentioned download would crash the computer with the firewall turned off. The computer did crash, but upon reboot the Lavasoft displayed the usual messagebox asking me to allow it to send information to Lavasoft. (I did.) That implies to me that the firewall was somehow involved in the crash. (Unless it was from one of the other lavasoft products -- Adaware aor Adwatch.)
How can I completely shut down the firewall? (and Adwatch?)
The "Suspend Protection" you describe will turn off all the firewall protection.
You mention that the computer crashes with the large file, does the system give a blue screen? If so can you capture the stop code displayed on the blue screen?
Also have a look in the event log for a time when the system crashed, on XP open Control Panel (if in Category view select Performance and maintenance first) then select Administrative tools then select the Event viewer icon.
When Event viewer opens select the system category in the left-hand panel and scroll down the right-hand panel for a time when the crash occured. Open any error messages, do they give any indication of what component was failing?