netstat shows suspicious connections

since few days,  there are lot of suspicoius activities on my desktop like double click does not open the file or database connection.
hence to check it i executed netstat command to see who is connected to my machine
and everytime i have this problem and after i run netstat i get list of connections, one of which is machine of my coworker. everytime i have such unusual behaviors running on my pc and i run netstat i find a connection with my co-workers' machine
the connection was through port - 1865
can you pl help whats going on,,,
at999Asked:
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OriNetworksCommented:
You can begin by running netstat -b

the -b switch will show you what program is running on that port. It may be nothing to worry about but my biggest question is are you using a firewall?? This is the most basic step you can take to protect yourself. Also, do you have any antivirus software installed and up to date. Lastly, do you have a good AntiSpyware program such as Microsofts free Windows Defender installed?

I would do a full scan with you AntiVirus and AntiSpyware software just to be safe and make sure your firewall in ON
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phototropicCommented:
A Hijackthis scan log would help to show what is going on on your pc.

Download here:

http://www.trendsecure.com/portal/en-US/tools/security_tools/hijackthis/download

Download the installer. Click on "Do a system scan and save a logfile". Post the scan log here via the "attach code snippet" box below.
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at999Author Commented:
thnks for ur comments...

actually this is not continuous ,....
sometimes this happens, and everytime i see such supicious behavior of applications I use like double click on that application wont work etc.,  i find that the machine of my co-worker is connected to my machine

when i do a netstat -b,  it does not list any program that is running on this port...

i'll try turning firewall on...  will the window's xp firewal be enough
mny thnks
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at999Author Commented:
Netstat commands shows this

TCP    DEF:3782           ABC http  ESTABLISHED     732
c:\windows\system32\WS2_32.dll
C:\WINDOWS\system32\WININET.dll
-- unknown component(s) --

where ABC is my coworker's machine and DEF is my machine  
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