Can anyone diagnose the cause of this message?
The computer keeps restarting all the time, yesterday I had this message 6 or7 times
But apparently it is only when I go on internet. For example, I dial up, and if I am lucky I get to the page I want, before the computer die, for instance Techspot, but if I disconnect the computer can stay turned on for ages, odd.

Driver_irql_not_less_or_equal
Stop: 0x000000d1 ( 0xf997b45b, 0x00000002, 0x00000000, 0xf41a29ed )
Mtlstrm.sys – address f41a29ed base at f40da000 datestamp 3e4faf50

Driver_irql_not_less_or_equal
Stop: 0x000000d1 ( 0x8c8a547e, 0x00000002, 0x00000000, 0xf3fbb41f )
Mtlstrm.sys – address f3fbb41f base at f3ef2000, datestamp 3e4faf50

Driver_irql_not_less_or_equal
Stop: 0x000000d1 ( 0x7a9c3a87, 0x00000002, 0x00000000, 0xf49e5a1d )
Mtlstrm.sys – address f49e5a1d base at f491d000, datestamp 3e4faf50

Bad_pool_header
Stop: 0x00000019 ( 0x00000020, 0x81e87f38, 0x81e87f68, 0x0a060010

Go here for an explanation of Windows error messages.

The Mtlstrm.sys is one of your modem drivers try getting the latest drivers and or uninstalling and then reinstalling the drivers.

Regards Howard