what book is advisable for download to learn vb

We're assuming that you're not looking anything that would be an illegal download, right?

You might want to check Microsoft's VB 2008 Express site - they have a lot of free learning material - http-://www.microsoft.-com/express/default.aspx

Watch out when downloading ebooks "freely" of the web as alot of people share them, but it's against copyright. 

Saying that you can buy ebooks, like the Dummies guides for VB: http-://www.diesel-ebooks.-com/cgi-bin/item/0471783617/Visual-Basic-2005-For-Dummies-eBook.html (the Dummies series are very good to wet your taste buds on the subject), plus there are various tutorials like this one: http-://www.oflameron.-ru/ebook.htm

If you're a member in a professional Computer Association like the BCS, you'll have access to online books library like: http-://www.books24x7.-com (and the like).