My gpu is a gtx 460 (sli). I disabled sli but the flash thing continues.
Running at maximum settings (1920x1080). Didn't try to disable HDR yet.
Edit: Took a http://img508.imageshack.us/img508/6613/falloutnv20101019085148.jpg.
Windows 7 (64bits)
i5 760 (3,6ghz)
Sli GTX 460 1gb (stock clocks)
4gb Ram
Latest driver 260.89. Did a clean install.