If you boot from an original DVD, you can also 'Repair Disk'.
Hard drive > Applications > Utilities > 'Drive Utility' after opening, select the hard drive in the left column and 'Repair Disk Permissions'. Next is 'Drive Utility' - located on this path It is the first fix to help clear up any issues you maybe having with MS Office. Select the 'repair data base' option and run the utility. Hard drive > Applications > MicroSoft Office 2011 > Office > Microsoft Database Utility.app
The simplest is actually built into the Mac already. You can run some simple maintenance programs. There are simpler ways to cleanup your Mac, though not as effective. If you have a full backup using TimeMachine you can wipe the hard drive, reload the Snow Leopard OS and then restore everything back to the same setup with TimeMachine and the program 'Migrate' found in the Utilities folder inside the Applications folder. It's just like rebuilding a car engine, but like a car, that may involve a lot of work. Wipe the hard drive and reinstall the programs and your data. The best way to speedup sluggish Mac computer is to rebuild it.
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