As a start..
by Carol~ - 5/8/12 3:37 PM
In Reply to: Eset detects a Trojan - win32/rootkit.whistler.A trojan by dhruv84
I have some questions, most of which I'm not going to ask now. But I am curious to know if you were experiencing any problems, prior to the error messages. I ask because not that long ago Eset had been detecting rootkits, when in fact they didn't exist. In another words, they were false positives. If you update Smart Security on a regular basis, I would think (unfortunately) it's not your case.
You mentioned 'it might be possibly due to some corrupt hdd sector'. W32/Whistler along with other bootkits, infect the system's Master Boot Record (MBR). Is that what you're referring to? Considering the nature of this infector, I'm not totally convinced we'll be able to disinfect your system with the tools we utilize here. But the below would be a good place to start.
Kaspersky's TDSSKiller - Instructions are listed below. (Additional instructions can be found here)
Best of luck..