Hi

 I've been using bitcoin since I saw it slashdotted back in July. I installed it on my machine at work, which is always on, so it is always running. The machine I am using is an Intel quad core Q6600 @ 2.40 Ghz. I have 2 GB or RAM. I am running Windows XP. My average Hash rate is 2252 khash/s.

I installed the bitcoin client on July 11.
On July 13 I generated 50 BTC
On July 15 I generated 50 BTC
On July 20 I generated 50 BTC

I now have 150 BTC. Since then I haven't generated a single bitcoin!!!

I used the calculator here: http://www.alloscomp.com/bitcoin/calculator.php
With the folliowing info:
Difficulty Factor   712.88486455
Hash Target   3.78175167291E+64
Hash Rate (khps)   2252

Probability   Time
Average   15 days, 17 hours, 40 minutes
50%           10 days, 21 hours, 46 minutes
95%           47 days, 3 hours, 24 minutes

Since July 20th it has been 57 days, and I haven't generated anything. Is this strange to anyone? Why am I not getting anything at all?

Good luck!