u're wrong sic, reinstalling wont fix it, u have to change your registry... steps:
Click on Start then Run.
Type regedit and click OK.
Click on the + icon beside the HKey_Local_Machine branch.
Click on the + icon beside the Software branch.
Select the Battle.net branch and press the delete key.
Click on the + icon beside the HKey_Current_User branch.
Click on the + icon beside the Software branch.
Select the Battle.net branch and press the delete key