dropping frames

[lllslinklll]

using beyond tv, recording and live video, i kept getting coppy video, looking like someone pauses the feed for a split second every second.

using WinTV2000 i noticed that its dropping frames, about 26 frames in 5 seconds. (this is at 29fps set)

here is a quick video i recorded.
http://files.filefront.com/choppyvid.../fileinfo.html

my cpu is running at about 23% occationally jumping up to about 55%. nothing more than that within beyond tv. the choppyness still happens when using just wintv2k.

this happens with any mpeg codec i use..

Any ideas?

I'm using wintvusb (into a usb2 port)
amd athlon 64 3000+ (running at 2.0 GHz)
1 gig ram
win xp pro sp2
nvidia bfg geforce fx 5500oc