This could mean, one of two things.
1. you have a hidden proxy and i recommend posting in TwinHeadedEagle's thread to assist with malware investigation.
2. you might have a dns issue
You can follow the directions here:
http://kb.eset.com/esetkb/index?page=content&id=SOLN2505
However i have a feeling since you cannot reach the update servers at all, it is other conflicting software or settings on the PC that is blocking you from reaching, hence my first 2 opinions on the situation.
I would make a post in the malware removal and have someone examine logs of your system.
If you want, i could take a look at what may be going on, however according to forum rules here it might be against TOS for me to assist publicly.
To prepare for a system exam, you could follow this KB to receive support from ESET which is free with a legit license:
http://kb.eset.com/esetkb/index?page=content&id=SOLN3466