I was working with AdWords. And it was good. But than it stoped showing my messages. I didn't change anything. AdWords now don't even spend my daily budget. Impressions ammount became very small. Can anyone explain me what's the problem. Thanks..
How long has the reduced activity been happening? It's the holiday season here int he states and in some markets you'll see a significant reduction in traffic duruing this time. It could also be that you're starting to suffer from poor quality scores and are therefore seeing less activity. See: http://adwords.google.com/support/bin/answer.py?answer=10215 and http://adwords.blogspot.com/2006/11/landing-page-quality-update.html
Odds are (hard to tell from the info provided) if the account was under review the OP would be getting no impressions, not just reduced impressions.
People often forget when they're working with adwords that the actions of other advertisers can affect your campaign. Admittedly, it seems unlikely to have happened all at once, but if you've suddenly got stiff competition in your niche, it could cause your ad to be shown much less often - for example if you've dropped from the first page of the search results to the second page.
Thanks my friends. You helped me much. I hope it depends on the holidays. But I had the main part of impressions and clicks in the Google Network, but not in the Google search results. I made a request to the Google team, so maybe they tell me what's wrong.