"This is for Windows XP. For Vista, the MSI won't install without admin rights. Either disable UAC temporarily or create a batch file to execute the MSI and run the batch as admin.
Download the Ezra SIL Unicode Fonts 2.0 package. The most recent package, v2.5 requires the Keyman program which is no longer free. Extract the files. Execute \Ezra SIL Release 2.0\Keyboards\Tiro Keyboards\BHebSIL.exe to extract the keyboard files. Execute \Ezra SIL Release 2.0\Keyboards\Tiro Keyboards\BHebSIL.msi to install the keyboard file. Start -> Run -> intl.cpl -> Languages tab -> Details -> Add For Input language: select Hebrew. For Keyboard layout/IME: select Biblical Hebrew (SIL). Click OK. Start -> Run -> control fonts. Drag the files in \Ezra SIL Release 2.0\Fonts\ into the font window to install them.
Now when you select the font Ezra SIL in your word processor and switch to Hebrew language (ALT־SHIFT), you will be able to enter the accents as you type. Refer to \Ezra SIL Release 2.0\Keyboards\Tiro Keyboards\BiblicalHebrew(SIL)Manual.pdf pages 7-10 for the keyboard maps.
I've found this to be the fastest and easiest way to write Hebrew for any serious length with cantillation marks. I opted for the BHebSIL keyboard over BHebTiro b/c I find BHebSIL to be more intuitive; the vowel pointings match their rough english equivalent key without needing to hit shift: patah to A, segol to E, etc."