You can't resize it, the narrow look is dependent on your screen resolution.
You can turn off the On Top Look, though. Click Start > type Sidebar
Properties > uncheck 'Sidebar is always on top of other windows. Its not a
solution, but a more pleasant look and feel to the Sidebar and it looks less
intrusive with bright wallpapers too.

--
Andre
Blog:
http://adacosta.spaces.live.com
My Vista Quickstart Guide:
http://adacosta.spaces.live.com/blog...3DB!9709.entry
"Jazz" <> wrote in message
news:AB5130F2-9362-4B7A-8CD9-...
>
> IS there a way i can change my side bar back to it's original size? It
> used
> to be a lot bigger now it's very narrow.
> "medivac278" wrote:
>
>> Is there a way to resize my side bar? i would like to make it wider. it
>> is so
>> narrow that i can barely see what is in it