Help! Vista Home Premium. Admin Account WiFi Speed Good. Other User Account Speed Not So Good.

I have two accounts setup on my laptop, one for myself which is the
admin account and another for my wife.

My laptop can connect to my router without any issues and the signal
strenths are strong, but the problem I'm having is that, for some
reason when my laptop's connected using my account, the internet
download speed is satisfactory.

But when my laptop's connected to using my wife's account, for some
reason the speed gets so slow that most of the time it takes a long
time to even load webpages, let alone being able to stream videos and
etc.

I'm using WPA-Personal/AES encryption between my laptop and my router.

I was wondering if someone can suggest some settings or configurations
I can check to see if something can be causing such a difference in
the internet speed between the two accounts?

I don't think this is a hardware issue between the laptop and the
router. Thanks for your time and courtesy.