You could try the following :
Go to START - RUN and type ipconfig /flushdns
If you use IE go under Extra and click on "reset websettings "
Download Winoscketfix here
Reboot and try to upgrade your anti-malware programs. One thing I saw you mentioned Ewido. This has changed into AVG. Please check the download links for AVG Anti-Spyware and Antivirus in ,my sig.
Uninstall ewido and install both new AVG programs
If still not succesfull do the following
1) Download AVG Antivirus and AntiSpyware free as well as the latest updates from another computer. Use a memory stick to do so.
2) Install and run these and try again