Hi,
As i think this is problem of ur options sitting , Change the visual source Environment sitting .
Click . Tools -> Option-> Source Control -> Environment.
Change the options only one Check box. Don't show check in dialog box when checking in items.
- Checking in item Behavior
On Save and on Edit sit Check out automatically
Allowed check in items to be edited is uncheck.
Furhter I also recommend that you run the analyze utility to dectect the integrity issues in your soruceSafe database.
Good luck.