"Unable to load the Parallels driver"

I use Parallels 5 (latest build 5.0.9376) on an iMac with newly installed Lion OS. For the first several days after I installed the Lion OS, my Parallels worked fine. But this morning, no luck. When I try to open Parallels, I get this error message "Unable to load the Parallels Driver. Restart your mac and try again." I did, but doing so did not help. I still get the same error message.

I purchased Parallels 5 a year or more ago as a download, so I don't have the option to reinstall because I don't have an installation CD.

Can someone please help me.

Phil

 

Not sure why it worked fine at first, but Parallels doesn't want Version 5 to run.
You not having saved the downloaded file is on you - maybe you can cheaply buy the install disc from someone if you still have your key.

To use version 5 on Lion (it actually does work), you need the Launcher:
https://discussions.apple.com/thread/3191409?start=15&tstart=0
http://www.macuser.de/forum/f105/parallels-desktop-5-a-592107/