We changed servers
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Hello,
First, moving servers should not affect your site rankings at all. Unless something in the move went wrong and lost some of your files in the transfer. Or you moved to an inferior server from your old one, but since most people move to better ones, I highly doubt that's the case.
The first thing I noticed when I visited your site is that you had no robots.txt file (www.transfers-in-europe.com/robots.txt). And since you have a log-in area, I'm assuming that you want it so some of your site is not crawlable by search engines. If you don't put your robots.txt at http://www.transfers-in-europe.com/robots.txt, the search engines won't find it.
After you get your robots.txt up and going, the second thing I'd recommend is making sure you have an xml sitemap. You can use Google Webmaster Tools and Bing Webmaster Tools to expedite the process of their crawlers crawling it.