What OS system change? from what to what?
You may have a bad install of Flash there a uninstall on adobe's site then a reinstall.
Or try creating a different profile on the PC and try running it from there
Try deleteing temp files also
Let us know ~Lee
Found this link in the forum take a look Flash Problem resolved
Lee Scott - Nikon D3/D300/D5000 - |shaved Nikkor 10.5 mm| Manfrotto 055XPROB tripod /322RC2 Grip - Mrotator TCS |CS5 | PW7 & TW6.5 Pro
To err is human ... to not try is just plain lazy