I deleted Library/Preferences/SystemConfiguration folder

Reinstall from your latest Time Machine back up.

OUCH! Time to repair disc me thinks... Or reinstall the whole OS.

A lesson learnt on why Backing up is imperitive!

Best of luck.

I would restart and press Shift key after chime, wait until the process completes, run Disk Utility for repair permissions, and restart normally.

If problems remains unsolved, reinstall. Never, really never play with system files if you are not an expert to play with.

You don't have a back up???? That is asking for a disaster.

try to boot directly into the Recovery HD, restart, wait for chime, press and hold COMMAND-R. From there try reinstalling Lion over the copy you have now. You will still ned to adjust some of your settings, but chances are good it will restore the missing components causing you trouble.

If you had a Time Machine backup, you could have just gone back to the last backup you had before deleting the folder.

saddact wrote:

What can I do to resolve this? I know I was stupid to delete that folder but I don't know what to do from here.

These preferene files should have been re-created (to default pref's), causing you to only reenter your preferences

I assume he may have deleted other files as well, not only pref files.

There are only preferences in the /Library/Preferences/SystemConfiguration folder

Great!

Now, please consider backing-up your Mac. All hard drives fail, sooner or later; files sometimes get corrupted; users make mistakes, computers (especially laptops) sometimes get lost or stolen, etc., etc.

You might want to review the Time Machine Tutorial, and perhaps browse Time Machine - Frequently Asked Questions.

And/or, see: http://www.reedcorner.net/guides/backups/

Alternatively, Carbon Copy Cloner is a reliable and free way to back up and create a bootable clone of your machine.

Whereby, if anything fails on your initial instalation, you can still operate and utilise the bootable backup.

Best of luck.

You gave yourself an unnecessary headache by the sound of it. That folder would have been recreated if you'd just restarted the machine, as I think Tony pointed out above.

Take the advice about keeping a bootable clone while you're here, especially if you have a penchant for messing about in the Library folder. Use Carbon Copy Cloner and put it on a regular timed schedule. You can choose anything from once an hour to once a day (of course you can choose longer periods, but then you're likely to lose a lot of work).

If you have a good backup of your system and files, you may safely play with installing and reinstalling everything.