I have applications which won't work now lion 10.7 is installed do I have to re-install them all?

I have just installed li0n 10.7 on my computer and some other applications now won't work.  Do I need to re-install these ?

Depends on what they are.
If they are old, PowerPC based programs, they won't work under Lion. If they are Universal applications, then reinstalling might work. However, you should check with the developer to see if there are any updates.

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