Vista+usb wireless internet=problem

computer:bought 2 weeks ago
HP Pavilion dv4-1220 us
Vista Home Premium x64

Internet:baught 2 weeks ago
Alltel Wireless
Hauwei EC168 Rev A

Problem: Started 2 weeks ago
Connection drops while I am downloading files or tring to watch a video using flashplayer internet goes "dormant" sometimes if i am extremely lucky it will hold longer then other times. I have no problem surfing the net. Just "buffering" videos and downloading files i.e. Patching WoW or watching videos on Myspace,Youtube, or anywhere that invovles a flashplayer. Its seems to be at random.

but never holds more then 25 min and i only get that long if i am really lucky

its as if something tells my notebook " hey internet can go dormant now, we are not doing anything." but in reality it is doing something.

My sister uses the same connection but runs XP with no problems at all

hmmmmm

nobody knows the trouble ive seen nobody knows but me.