To Enable
1. Start>Run: Type 'Regedit'
2. Drill down to HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
3. Select Explorer and open 'NoFind'
4. Clear the value and click OK
5. Log off and log back in to have the search option available in Start menu
To Disable
1. Select the Run option from the Start menu.
2. Type "cmd" and hit Enter.
3. Type "reg Export HKU backup.reg" and hit Enter.
4. Type "reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /v NoFind /t REG_DWORD /d 1" and hit Enter.
5. Logoff and log back on.