You could try this registry fix:
Pages in Windows Vista Help and Support are not displayed correctly, by
Ramesh Srinivasan:
http://www.winhelponline.com/articles/194/1/
"Guru" <> wrote in message
news:C43B337E-7AE5-4C3E-B073-...
> Hello,
> For some reason the fonts on my windows help and support has changed to
> what
> looks like times new roman or somethign ugly like that. It doesn't look
> like
> it normally did. Recently installed programs are betas of windows live
> messenger, mail and writer. Also Adobe Dreamweaver CS3.
>
> Any ideas how to get it back to normal?
>
> Thanks
> Guru