Can't answer about Vegas specifically, but in general, it sounds like you had white balance set for tungsten (indoor light) which is very yellow/orange, and were shooting outside.

Usually the problem with tungsten-to-daylight white balance problems is there's so much extra blue that the remaining colors are really deficient, so just removing the blue, you end up with a desaturated image.

I haven't had great luck with autocorrection plugins because the color tends to shift during the clip with camera movement. I've had pretty good luck using manual RGB color correction, removing a substantial amount of blue, and adding in a bit of magenta and yellow. Sometimes, if it's really far off, I have to do two separate layers of color correction.

My experience is it's hard to get it to the point it looks completely natural if it's really heavily blue to begin with (such as a whitebalance of 3200K while shooting in the early morning outdoors) but you can usually get it to look pretty decent.

Here's a tutorial for doing this in Vegas. It sounds very similar to how I approach it in Premiere, but I don't use Vegas so can't vouch for it.

http://videoediting.digitalmedianet.....jsp?id=166552