Trouble with grep

[Jason Pursel]

I’m running grep (GNU grep) 2.5.1 on WinXP and have a constant problem when 
trying to perform a search.

Using the following search:
grep –r –l Sata1 *.err
The following message appears:
grep: *.err: Invalid argument

Using:
grep –r –l Sata1 *.*
Executes successfully

Any ideas?