i guess you'd better use a application to diable F3 key,something like Vpc or other program could control that,we use the SMENU in the internetcafe,that could control the user's rights fully,eazy to manage,maybe you could use that.
Are you looking to disable it during startup or just after windows has started? Or an Application? If you do not want it to be used in either go to the application and create a fake assignment and assign it F3. or if it is in the normal OS create a bogus application that doesnt do anything and assign it F3.
Assuming you want your users to have Find capability without using F3, your best bet is to map the key to a null value (ASCII 0 or 255).
If you want to disable Find completely, go to this registry key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Policies\Explorer], create a value named "NoFind" with data type Reg_DWord, and set the value to "1"
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disable F3 Win95
thanks