Event log entries - what do they mean?

I am new to SQL Server so any help would be greatly appreciated!
I have checked our event viewer, and the following are listed as information entries. I would like to know why they are appearing and what can I do to prevent them from displaying?

8128 Using sqlmap70.dll version 2000.80.534 to execute extended stored procedures xp_findnextmsg

15457 Serverity 0 state 1
Configuration option nested triggers changed from 0 to 1. Run teh RECONFIGURE statement to install

8128 Using xpstai.dll version 2000.80.534 to execute extend stored procedure xp_instances_regread

8128 Using xpslqbot.dll version 2000.80.194 to execute extended stored procedures xp_qvThese entries merely reflect activity that is occurring on the server. I don't think
there's any way to suppress them.

"8128 Using sqlmap70.dll version 2000.80.534 to execute extended stored procedures
xp_findnextmsg" These types of messages occur the first time an extended stored
procedure (xp) is executed. The xp could be called explicitly by a user, or it could
be the result of an internal process such as SQLDiag.

"15457 Serverity 0 state 1 Configuration option nested triggers changed from 0 to 1.
Run teh RECONFIGURE statement to install" This message means someone either ran
sp_configure or used SEM's server properties tab to change the settings for the
listed configuration value. BOL has information on sp_configure.

Cindy Gross, MCDBA, MCSE
http://cindygross.tripod.com (http://cindygross.tripod.com/) This posting
is provided "AS IS" with no warranties, and confers no rights.