System get no response while running amule/mldonkey in Ubuntu 7.10

[webflier]

Dear all,
When i launch amule or mldonkey for download, the system will get no
response in 1 hour(maybe several minutes, maybe tens of minutes), mouse
doesn't work, keyboard doesn't work,sound doesn't come out anymore, the only
thing i can do is press the reset button.
the system is very stable as long as the amule and mldonkey are not
launched.
does anyone has a similar situation? how to solve it?

My box is a Compaq NC620 laptop, PM 1.4G, 512M, Realtek wireless card, with
Ubuntu 7.10 installed.
both amule and mldonkey are from the respository, installed by Synaptic
Package Manager。

Thank you all.

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