Yes the DCOM Exploit is dangerous.
Very first result in a
google search at the moment
Incase the search changes, go
here
Also
this and
Go to
Code:
Start Menu > Run > services.msc > ENTER > locate Remote Registry > right click > Properties > General tab > drop down box > Disabled > OK
It's possible that some computer on your lan is infected with a worm which is trying to use this exploit to spread into your system. Install
SP3 and keep the system patched with all the critical updates using automatic updates, use a
firewall other than windows firewall and Avast has blocked the attack so you are ok for now.