I think I'd do a complete virus scan, then check for sypware/malware and totally rule that out before you get too much farther into debugging the network.
Download / Install / Update / and Run:
Adaware SE check for any updates before running it.
Get the plug-in for fixing VX2 variants. You can download it at this
SITE
To run this tool, install to the hard drive, then open Ad-aware->Add-ons and select VX2 Cleaner. Then click Run Tool and OK to start it. If it's clean, it will say Status System Clean. Otherwise, you will have to click on the Clean button to remove the VX2 infection.
Download and install
Spybot S&D . Run Spybot and click on the 'Search for Updates' button. Install any updates that are available. Next click on the 'Check for Problems' button. Let it run the scan. If it finds something, check all those in
RED and hit the
Fix Selected Problems button. Exit Spybot. If you keep getting the DSO Exploit entries, even after you updated Windows and fixed them, then download the
Spybot DSO Exploit Fix and install it over the current Spybot installation.
Scan your pc with one of these free online scanners:
Panda ActiveScan
RAV AntiVirus
Housecall. Be sure to put a check the box beside AutoClean.
Also, Download and install:
HiJackThis 1.99.1.
(Always create a Folder for HiJackThis anywhere but your Temp/Temporary Internet Folders or Desktop. A good place to make a folder would be in My Documents, as this is where it will save the backup files needed if there's a problem.)
Then doubleclick HijackThis.exe, and hit "Do A System Scan And Save Log". Make sure all Windows and Browsers are closed.
When the scan is finished, best to save your text file in the same folder as where you put HiJackthis.
Create a New Thread and include a fresh HJT log in
HiJackThisLog Help Forum and Copy/Paste the info from your saved Hijackthis log file into your new topic. A Moderator/ Security Team Expert will give you instructions.
***DO NOT TRY TO FIX ANYTHING, MAJOR DAMAGE CAN BE DONE TO YOUR SYSTEM IF THIS TOOL IS USED INCORRECTLY, PLEASE WAIT FOR AN ANALYST/
MODERATOR TO GIVE YOU INSTRUCTIONS***
Always describe your problem and any programs you have used to try to resolve your issue. Your description can go a long way to solving/repairing your particular issue.