This is a clean install (no changes to any configs)?
Do you get any startup warnings/errors (red text) anywhere in the XAMPP Control Panel log when you start it?
15:37:36 [main] Initializing Control Panel
15:37:36 [main] Windows Version: Windows 7 Home Premium SP1 64-bit
15:37:36 [main] XAMPP Version: 1.8.1
15:37:36 [main] Control Panel Version: 3.1.0 Beta 6 [ Compiled: September 20th 2012 ]
15:37:36 [main] Running with Administrator rights - good!
15:37:36 [main] XAMPP Installation Directory: "h:\xampp\"
15:37:36 [main] Checking for prerequisites
15:37:36 [main] All prerequisites found
15:37:36 [main] Initializing Modules
15:37:36 [main] Starting Check-Timer
15:37:36 [main] Control Panel Ready
15:38:39 [Apache] Attempting to start Apache app...
15:38:39 [Apache] Status change detected: running
Did you use the portable version on all of them you tested?
Do you really need the portable version?
Have you tried a sanity check to see if a different version would work (installer or zipped)?
Can you even access the default XAMPP directories (http://localhost should redirect to http://localhost/xampp by default unless you changed things)?
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