on a working PC and compared it to the non working. Type netsh winsock reset at the command prompt, and then press ENTER.
How to troubleshoot network connectivity problems in Internet Explorer
http://support.microsoft.com/kb/936211
http://www.chicagotech.net/
Download HijackThis and run it and then go to the site below to analyze it to find out if you are infected.
http://aumha.org/downloads/hijackthis.exe
HijackThis log file analysis
Hijack This opens you a possibility to find and fix nasty entries on your computer easier. Therefore it will scan special parts in the registry and on your harddisk and compare them with the default settings. If there is some abnormality detected on your computer HijackThis will save them into a logfile. In order to find out what entries are nasty and what are installed by the user, you need some background information.
A logfile is not so easy to analyze. Even for an advanced computer user. With the help of this automatic analyzer you are able to get some additional support. Just paste your complete logfile into the textbox at the bottom of this page. Due to a few misunderstandings, I just want to make it clear that this site provides only an online analysis, and not HijackThis the program.
http://hijackthis.de/
You can also try this.
Download Malwarebytes Anti-Malware, install it and update it and scan the PC's in Safe Mode.
http://download.bleepingcomputer.com/malwarebytes/mbam-setup.exe
Keep us informed as to your progress if you require further assistance.
If you think that any of the posts that have been made by all TR Members, have solved or contributed to solving the problem, please Mark them as Helpful so that others may benefit from the outcome. ;) :D
