How increase speed of my 20 mb virgin media broadband ? Too much slow during middle afternoon and night :(?

We live in coventry and buy 20 Mb broadband with virgin media but we have problems during during middle afternoon and night, connexion became very slow, for example we can download at 300 ko during morning but only 55 ko during night ... How to change this in netgear wizard, what must i change ? (sorry my english... show more We live in coventry and buy 20 Mb broadband with virgin media but we have problems during during middle afternoon and night, connexion became very slow, for example we can download at 300 ko during morning but only 55 ko during night ...
How to change this in netgear wizard, what must i change ?
(sorry my english is not very well)
Update: I know there is something to do to unlock speed but i don't know how doing this.
Update 2: There is other people who have the same problem, our password has not been stolen. I know its during peak hours but with 20 mb it should be faster ...
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