Oookay...

[Rengori]

Whenever I try to fast forward though a music file in Winamp it crashes and this message comes up.
EDIT: And it's not just with the file type, I tried it with various filetypes and it crashes whenever I fast forward.

[rubah]

I've gotten that a few times. Not consistantly. Try changing skins or reinstalling.

[crono_logical]

Try disabling any/all DSP/effect plugins you have, I'd guess one of them is unstable and doesn't like you skipping through music :p