How do I reinstall os x moutain lion after deleting necessary files?

When trying to get my Canoscan 9550F to work with OS X 10.8.x, I was able to add it to the system settings under printer, but still it didn't work. I decided to make sure the Canon driver and Apple driver weren't fighting, so I deleted some files. Now, even though I can see the scanner in the "about this Mac," I cannot add it anymore to the printer area. I should have dragged those files to the trash, where I could have restored or put back the files, instead of to the desktop.
My question, How do I reinstall OS 10.8.x when I installed it from the App Store to upgrade? I don't see it as files on my Mac to reinstall.
Thanks

Reboot to the Recovery partition and reinstall from there. Reboot, at the sound of the chime press cmd-r and hold it until the Recovery disk starts up.

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How to refresh and redirect into same page after deleting a file

Hi John,
One more help I need. I implemented the brows and download file functionality in my application successfully. And I am interested to implement delete also like download. If user will click on download three options will come open, save, cancel in case of download. But like download I want to put delete link which will delete the corresponding file.
I written the procedure in same fashion as download and compiled in my schema.
The code is here:
CREATE OR REPLACE PROCEDURE download_my_file_temp_delete (p_file IN NUMBER)
AS
BEGIN
DELETE FROM file_subjects_temp
WHERE ID = p_file;
END download_my_file_temp_delete;
And in
Home>Application Builder>Application ID>my_page > Report Attributes>Column Attributes
There I am entering
Link text : Delete
Target : URL
URL : #OWNER#.download_my_file_temp_delete?p_file=#Delete#
Where download_my_file_temp_delete is a procedure for deleting the file corresponding to ID .
Here id alias is DELETE so I am passing #DELETE#.
If I am click delete corresponding to any file its opening a blank page I seen URL is like
http://abcd.com:portno/pls/workspace/owner.download_my_file_temp_delete?p_file=4031625747435433
if I am clicking back and refreshing then getting file is deleted successfully.
That means procedure is working but I want that after clicking on delete link corresponding to any file same page should appear with refresh then my problem will solved.
Can u suggest me any approach.
Thanks && Regards,
Ravi

[This is not John, hope that's ok!]
This kind of thing is best done by rendering checkboxes next to each file in your report region;using apex_item.checkbox(1,file_id) and providing a Delete button that would fire a after-submit process that does
for i in 1..htmldb_application.g_f01.count
loop
download_my_file_temp_delete(htmldb_application.g_f01(i));
end loop;[And of course a same-page branch on the page]

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How do I reinstall os x moutain lion after deleting necessary files?

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