Unable to load Query Builder component

Hello,

When I try to refresh a report in Crystal Reports 10, it displays this error message:

"Failed to load database information."

"Details: Unable to load Query Builder component."

Then, when I try to register querybuilder.dll, RegSvr32 gives this error:

"querybuilder.dll was loaded, but the DllRegisterServer entry point was not found."

Any ideas?