New
#11
Everything I suggested only covers the routers settings and doesn't deal with the adaptor you are using which I'm not familiar with at all.
Updating the drivers for the wireless PCI adaptor would be good, I would think that Windows would have a driver for this so check to update the driver in Device Manager or Windows update.
When you say slow I have no idea how slow, can you post the wireless speed just like the picture below on the right.