root password change/error

Hi

My root password suddenlt just chnaged and cant get into the admin of my trixbox, below is the error that I am gettintg, got this from the log files... can anyone help, how can i change the password agin to what I want, I am using webmin to get access to the files...
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Feb 8 05:51:08 trixbox1 sshd[3755]: Received disconnect from 24.84.188.228: 11: Bye Bye
Feb 8 05:51:09 trixbox1 sshd[3760]: Invalid user higuchi from 24.84.188.228
Feb 8 05:51:09 trixbox1 sshd[3761]: input_userauth_request: invalid user higuchi
Feb 8 05:51:09 trixbox1 sshd[3760]: pam_unix(sshd:auth): check pass; user unknown
Feb 8 05:51:09 trixbox1 sshd[3760]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=24.84.188.228
Feb 8 05:51:09 trixbox1 sshd[3760]: pam_succeed_if(sshd:auth): error retrieving information about user higuchi
Feb 8 05:51:11 trixbox1 sshd[3760]: Failed password for invalid user higuchi from 24.84.188.228 port 60674 ssh2
Feb 8 05:51:11 trixbox1 sshd[3761]: Received disconnect from 24.84.188.228: 11: Bye Bye
Feb 8 05:51:13 trixbox1 sshd[3762]: Invalid user kawakami from 24.84.188.228
Feb 8 05:51:13 trixbox1 sshd[3763]: input_userauth_request: invalid user kawakami
Feb 8 05:51:13 trixbox1 sshd[3762]: pam_unix(sshd:auth): check pass; user unknown
Feb 8 05:51:13 trixbox1 sshd[3762]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=24.84.188.228
Feb 8 05:51:13 trixbox1 sshd[3762]: pam_succeed_if(sshd:auth): error retrieving information about user kawakami
Feb 8 05:51:15 trixbox1 sshd[3762]: Failed password for invalid user kawakami from 24.84.188.228 port 60801 ssh2
Feb 8 05:51:15 trixbox1 sshd[3763]: Received disconnect from 24.84.188.228: 11: Bye Bye
Feb 8 05:51:17 trixbox1 sshd[3776]: Invalid user matsuoka from 24.84.188.228
Feb 8 05:51:17 trixbox1 sshd[3777]: input_userauth_request: invalid user matsuoka
Feb 8 05:51:17 trixbox1 sshd[3776]: pam_unix(sshd:auth): check pass; user unknown
Feb 8 05:51:17 trixbox1 sshd[3776]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=24.84.188.228
Feb 8 05:51:17 trixbox1 sshd[3776]: pam_succeed_if(sshd:auth): error retrieving information about user matsuoka