Have you updated your graphics card drivers ?
That's the only thing left to check, software-wise. The other thing to make sure is you are running the correct resolution and refresh rate for the screen.
Flash does have known "text rendered blurry issues", but turning off hardware acceleration in flash normally fixes it. If it does not fix it means your graphics card drivers need updating.
You may want to try read this too.
http://support.mozilla.com/en-US/kb/fonts-look-blurry
The other thing I would do is write to Flirt4free with this problem, because there is ways they can code the applet in flash to not cause this sort of problem for some users too.
Use this to report the bug you see and give them as much information as you can, eg system specs, windows version, browser version, flash player version. etc
http://www.flirt4free.com/support.php?a=display_feedback_form
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