why do i have this error at every boot w7 64bit?

Hi

i did notice that with MyEventViewer at every boot i got this error

Code:

Warning
Microsoft-Windows-Kernel-PnP
id 219

Code:

Error
WinMgmt
10

Code:

Error
Service Control Manager
7026
At startup it was not possible to load the following drivers:
cdrom

Code:

Error
DCOM
10016

Code:

Warning
Microsoft-Windows-DNS-Client
1014
Timeout name resolution for the name www.msftncsi.com. No DNS servers configured responded.

can someone give me some helps/feedbacks?

thanks