Sometimes one of these works:

Tools|Options|General|Ignore other applications (uncheck it)

--- or ---

Close Excel and
Windows Start Button|Run
excel /unregserver
then
Windows Start Button|Run
excel /regserver

The /unregserver & /regserver stuff resets the windows registry to excel's
factory defaults.

Lidia wrote:

I cannot open files clicking directly on them from my documents for example.
A week ago I could and I think that som was disabled. Somebody has had this
problem?

--

Dave Peterson