Instrusions attempt

In te last 2 days, i keep getting warning from norton antivirus 2009 that norton is preventing and blocking instrution attempts and blocking "send terminate message to windows" access

 

and here is what i get:

1)

An instrusion attempt by 94.249.45.135 was blocked 

Application path \DEVICE\HARDDISKVLOUME1\WINDOWS\SYSTEM32\SVCHOST.EXE

 

Risk name: MS RPCSS Attack (2)

attacking computer : 94.249.45.135 , 1808)

destination address PC3 (94.249.69.49. 135)

source address : 94.249.45.135

traffic description : TCP, Port 1808

 

and 

 

2) Unauthorized access blocked (send terminate message to windows )

 

actor: c:\windows\explore.exe

actor PID: 1688

target: C:program files\norton antivirus\engine\16.7.2.11\MCUI32.exe

Target PID : 3140

Action : send terminate message to windows

reaction: unauthorized access bloced

 

 

 

I got these warnings about 40 - 50 times in the last 2 days. I did a Full system scan but it didn't find any threats.

What is the problem and what can i do to solve it?