system
1
Someone is attacking my computer again and again.
The reports of avast anti-virus is warning me that "network shield blocked DCOM exploit attack from 210.54.64.87.
It appears to me that ‘210.54’ is constant and the rest of ip address is changing. Please help me. What should i do? 
Eddy
2
Please use the search function on this board and use “DCOM” as keyword. It has been explained many times already.
DavidR
3
Do you have a firewall?
A firewall should stealth your computer from the outside world. So the people running these port scans shouldn’t see your computer and attempt to exploit it.
The same first two groups of the IP address could signify an ISPs service and the the last two groups could be the randomly assigned number assigned to one of its users/members.
There are places where you can do a reverse IP address check, this returns the name of the domain when you enter the numbers IP (e.g. 256.256.256.256) address. Though it is time consuming and not very worthwhile.
Best to stealth you computer from the rest of the Internet and ensure that you OS is fully up to date, plugging these possible exploits when they are patched.
system
4
Hi,
Go to http://www.grc.com/ and click on ‘shields up’ This will tell you if your computer is stealthed or not.
I use Avast Home edition and XP firewall (SP2) and show completly stealthed.
Hope this helps.
Kind Regards
Jlo