i read the posted questions for same problem but seeems to be as my problem

domain : www.a2b.biz

category links doesnt work and its n the root of the domain not in asubfolder

when you click from front page on a category : page cannot be displayed
when request category front page from admin panle gives the followinf

Not Found
The requested URL /admin/categories/view.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

more info :

server : linux
mysql : 5

hosted company : host monster.com

also when click DB BackUP

found

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@a2b-biz.rosehost.info and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

If you are still having a problem, I would suggest deleting all the files and downloading a fresh copy of SSL, install from scratch following all the included directions.