hmmm... interesting..very interesting...The ask tool bar came with something "you downloaded". Some browser downloads offer it. What ever you downloaded that the ask tool bar came with.. you will have to delete. Usually when you download something that offers the ask tool bar it also gives you the option not to get the tool bar. By unchecking the box u dnt install it.But mistakenly u installed it.
You might find it in add/remove programs but i doubt it. Figure out what you downloaded and delete it. "The ask tool bar will go with it". Like other toolbars it is a "Low level spy ware"...nothing else...
As u have mentioned that u have scanned the whole computer with spyware nd all but everything in vain..isn't it?? Of course it is not a spyware my dear friend..you have tried all the complex procedures but did u ever tried the simple procedures??
It mite be a browser add-on a lot of people are getting inadvertently.
In FireFox got to Tools > Add-on >Extensions and disable anything there you didn't add
In Internet Explorer Tools> Internet Options> Programs >Manage Add-ons and find the thing which is disturbing u nd disable it.