BIDS in VS2008 not working for SSIS packages. - cannot load IDTSPackageSigning100......

Folks,

I'm trying to create a new SSIS 2008 package on my dev machine, but I suddenly get:

Error loading 'Package.dtsx' : Could not load type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSPackageSigning100' from assembly 'Microsoft.SqlServer.DTSRuntimeWrap , Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'.. 

I had SQL Server 2008 R2 on that machine for a bit, but removed it and re-installed 2008 with SP1. I also ran the "Repair" function of the SQL Server 2008 installation on it, to no avail....

Any ideas??