can't sync after new software updgrade

i upgraded the software on my PC to the latest version and now i can't synchronize my data.  the software freezes at Preparing Sync Review.

my wireless sync of calendar is not working either.  A friend of mine has a different BB and has the same problem since updating the software.  I downgraded to a prior version but the problem is not solved.  Any ideas?

my BB has v5.0.0.975  bundle 16 platform

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