WEP crack - no client & no traffic (I have .cap file with 7 IVs)

Hi!

Here is the situation:

I'm trying to crack WEP key, there is no clients at the moment (hardly used network I suppose...), I've spoofed the MAC address, but can't get injection started, as I can't pick up a single IV.
Although I have a .cap file with 7 IVs, can I use it somehow to start the attack?
Here are screen shots to illustrate my situation.

Also if RXQ is usually very high, but sometimes drops very low. Does it definitely mean that there is a client that is not in my range?

http://img808.imageshack.us/img808/9639/backtrack.png
http://img840.imageshack.us/img840/5180/kismac.png

Thank you in advance!

Now would be a good time to start reading. This is a widely covered topic and no need to repeat it here yet again.