Uninstalling/Re-installing Aptana
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If you need to fully uninstall and reinstall aptana, you must delete a few folders that are not automatically
deleted by the uninstaller.

You will know if you did not fully delete the proper folders if you get an error like the following:

!SESSION 2007-06-05 18:03:17.484 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.6.0_01
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB
Framework arguments: C:\Program Files\Aptana\Aptana Studio\AptanaStudio.exe
Command-line arguments: -os win32 -ws win32 -arch x86 C:\Program Files\Aptana\Aptana Studio\AptanaStudio.exe

!ENTRY org.eclipse.core.runtime 2007-06-05 18:03:19.640
!MESSAGE Product com.aptana.ide.rcp.product could not be found.

!ENTRY org.eclipse.osgi 4 0 2007-06-05 18:03:19.671
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: No application id has been found. 

To repair your Aptana installation:

Windows:
   1. Use the Windows control panel Add/Remove Programs utility to uninstall Aptana.
   2. Delete C:\Documents and Settings\Username\Application Data\Aptana\Aptana Studio\configuration.
   3. Navigate to where the Aptana application was installed, and delete your old plugins
   		and features folder (and all of its contents).
   4. Re-install Aptana. 

OSX:
   1. Delete ~/Library/Application Support/Aptana/Aptana Studio/configuration.
   2. Navigate to where the Aptana application was installed, and delete your old plugins
   		and features folder (and all of its contents).
   3. Re-install Aptana. 
   
Linux:
   1. Delete ~/.Aptana/Aptana Studio/configuration.
   2. Navigate to where the Aptana application was installed, and delete your old plugins
   		and features folder (and all of its contents).
   3. Re-install Aptana. 

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This information can also be found at:
http://www.aptana.com/docs/index.php/Tips_and_Tricks#Repair_your_Aptana_installation