Installed pretty urls, now all my pages 404?

[peps1]

How do I undo this?

[margarett]

Oh the joys of Pretty URLs...

First things first, if you have a backup, it might be worth to restore it now.
If you don't, check this
http://www.simplemachines.org/community/index.php?topic=400356.msg2782585#msg2782585
http://wiki.simplemachines.org/smf/A_mod_broke_my_forum

For future issues with MODs, check its support topic

[peps1]

restore database or forum, or both?

Think im going to keep away from Pretty URLs after this 

[margarett]

restore database or forum, or both?

I'd say both.

I imagine that your issue happens because you run a Windows host and Pretty URLs heavily depends of .htaccess which not always very well supported...

[peps1]

restore database or forum, or both?

I'd say both.

I imagine that your issue happens because you run a Windows host and Pretty URLs heavily depends of .htaccess which not always very well supported...

Done!

Much faster now my database is not 90% errors 

[margarett]

Ehehehe