Run > Type: regedit
Find the following keys:
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced
Right click on the right hand panel and select New > Dword. Call it EnableBalloonTips, double click it and make the value 0.
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced
Right click on the right hand panel and select New > Dword. Call it ShowInfoTip, double click it and make the value 0.
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced
Right click on the right hand panel and select New > Dword. Call it FolderContentsInfoTip, double click it and make the value 0.
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced
Right click on the right hand panel and select New > Dword. Call it StartButtonBalloonTip , double click it and make the value 0.
Exit regedit and enjoy your balloon free computer.