I got this network error (tcp_error) again and again when I surfed the web sites ,even in Geeks to Go.

I saw that my brother used Open VPN .After he used,I have that network error . In C:\Documents and Settings\khinelay\ , I found "client.ovpn" .
but i didn't find this in Program Files.

I want to know my problem is because of that ovpn ? or because of virus /malware????

Network Error (tcp_error)
A communication error occured: "Address not available"
The Web Server may be down, too busy, or experiencing other problems preventing if from responding to requests
You may wish to try again at a later time.
For assistance, contact your network support team.
Moreover, "Internet Explorer cannot display the web page "
Another error is
Network Error (tcp_error)
A communication error occured: "No route to host"
...
Thanks in advance ...
PS. I don't know what my problem is so, i'm sorry if i post my problem in wrong topic.
It is under malware ?
Thanks in advance

P.S. this is the second time i posted it .When i clicked "Post New Topic" , this tcp_error appeared .So, I reposted again.

My System:
Intel Pentium 4 CPU 2.40 GHz,512MB RAM ,NVIDIA GeForce FX 5200
MS Windows XP SP2
IE 7 , Firefox 3.0.1
ADSL