Melissa, here is a couple of tips for router placement.
1) Higher is better than lower
2) On top (of a cabinet, bookshelf, desk hutch) is better than inside
3) Away from large metal objects (filing cabinets, steel shelving, etc.) is better than near
You may also look into a signal booster. If you have a lInksys router they make a signal booster for it.
THis and other ideas can be found here
Ways to improve wireless performance
A few sections contain some very high tech stuff but some of it may help you. I think the signal booster is the way to go however. Factors such as what type of lighting, electronics nearby and type of wall construction (brick versus wood) all affect range and performance.
Hope this helps.