[Prob] Got Issues with connecting GS3 to Kies ?

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http://forum.xda-developers.com – Hello, I'm from India and using Galaxy S3 now. My phone (Galaxy S3) fails to recognize on Kies. I'm doing everything correct , but still it is not showing in Kies. Previously it worked for me, but now its not at all. Kies show this error message :- "Unable to connect to GT-I9300.Failed to retrieve device information." I've installed all the drivers successfully. I've updated version of Kies installed. Actually, I imported my contacts and saved it on my laptop. Now, I can open that "contacts.sbp" file only on Kies. Or is there any other way to again import (HowTos)