Possible bumpmap glitch... or my GPU is dying

I don't want to post this as a glitch just yet, since I don't have any other computer to test it on at the moment. I have a very simple capx here -- a sprite with a bumpmap over it, that messes up like CRAZY when it's near the edge of the screen.

The problem's most likely on my end, unfortunately.I've got the most up to date graphics drivers and I even tried reinstalling them, but it didn't change a thing. Oh, and several other bumpmap examples work perfectly -- this is the only one giving me issues.

Just to find out for sure, can you guys take a look and see what happens on your screen? Walk left and right with the Epic Red Square Hero Man(TM) and let me know if the sprite in the center starts flipping out or not. <img src="smileys/smiley36.gif" border="0" align="middle" />

db.tt/Bt5qT8Kk

I walked over left and right, then

I don't see glitch... it seems nice creep lol

Nice creep? Is that a good thing or a bad thing? <img src="smileys/smiley17.gif" border="0" align="middle" />

Well, seems my fears are confirmed. It's my computer... *sigh* This is what it looks like for me, by the way (doesn't show the crazy flickering though):

<img src="http://oi46.tinypic.com/2ihpcf7.jpg" border="0" />

Seems to work fine here. It's most likely a driver bug, since most graphics problems are.

Works fine in chrome, but does flicker with white blocks when in FF v15 for me. All graphics driver [nvidia 8800] are up to date.

<img src="http://img69.imageshack.us/img69/1381/facexls.jpg" border="0" />