Here's the rulset syntax for Illustrator:
EXISTS <Registry Key> "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Illustrator.exe"

Here's the ruleset syntax for Photoshop:
(EXISTS <Registry Key> "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Photoshop.exe") OR (EXISTS <Registry Key> "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Photoshp.exe")

Here's the ruleset syntax for Adobe 6.0 Professional:
EXISTS <Registry Key> "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{AC76BA86-1033-0000-7760-000000000001}"

and for Adobe 5.0 (full program, not just the free Reader):
EXISTS <File> "c:\program files\adobe\acrobat 5.0\acrobat\acrobat.exe"

Note: you can substitute 7.* for the other Acrobat versions. The key here is MATCHES "7.*" so that it will search for all versions of Acrobat 7  Simply replace 7.* with 5.*, 6.*, and 8.* for the other rulesets you create.

(<File Version> "C:\Program Files\Adobe\Acrobat 7.0\Acrobat\Acrobat.exe" MATCHES "7.*") OR  (<File Version> "c:\Program Files\Adobe\Acrobat\Acrobat.exe" MATCHES "7.*")

(<File Version> "C:\Program Files\Adobe\Acrobat 7.0\Reader\AcroRd32.exe" MATCHES "7.*") OR  (<File Version> "c:\Program Files\Adobe\Acrobat\AcroRd32.exe" MATCHES "7.*")