SQL Error OLE.INTEROP

Answer 1

My first guess would be Client Tool corruption.

I've occasionally had to uninstall my client tools and reinstall them. Boot after uninstall.

Answer 2

From MSDN forum http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=120476&SiteID=1

Answer 3

I had to add the registry file AND re-run "regsvr32 actxprxy.dll" This was a really odd and painful error. It only seemed to come into existence after installing VS SP1 but I really don't see why that would have happened.