VSS is not asking me for leaving check out file (Remain check out) while getting letest version

Hi,

I'm continously facing an issue, when ever i open a website from source control it always prompt me with the followoing msg:

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Microsoft Visual Studio
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The folder 'C:\Inetpub\wwwroot\TradeShores' is not empty. Local files in this folder may be overwritten by the copies from source control.

Do you wish to continue
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Yes No
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on clicking No it does nothing, and on providing new locataion it copies whole project from VSS into that new location.

2nd ) if i click "yes" then it overwrites all my files regardless of either those files were checked out or not.

i lost my data twice because of it. Kindly help me out.

Thank you,

Regards

Noorali Chagani