Rebooting -Serious System Error!

[sistershandy]

Hi
I am really new to this so I'm sorry if I don't provide the necessay info!
I have had my computer for 2 years. It operates on a Windows XP system. It has been fine until the last week or so when it keeps rebooting itself at random times, and reloads with a serious system error message. I have rad through a number of posts but have become more than a little overwhelmed!!!
I have attached most recent 5 minidumps to message.
Also, not sure if it's relevant but computer will not allow me to access HijackThis programme and simply logs off if I try.
Many thanks

 

[peterdiva]

All the dumps crash at your modem drivers. Look for an update for these drivers.

BugCheck 100000D1, {f7faa328, 2, 8, f7faa328}
Probably caused by : alcaudsl.sys ( alcaudsl+2f14 )
Image name: alcaudsl.sys Timestamp: Mon Dec 08 19:53:43 2003 (3FD45837)

 

[sistershandy]

thanks!

I've done that so I'll see how I get on!
THanks for your help