Sudden problems accessing webpages and iTunes & App store.

About 2 days ago, my iMac started having problems accessing the iTunes store (and downloading purchases), accessing the App store, and loading webpages (both on Safari and Firefox). The rest of my applications work without problems. At first I thought it might be a internet connection problem, however, I don't have any problems on my MacBook, iPad or iPhone. I tried fixing the disk permissions, but that had no effect. Any ideas on what I should try next. I thought maybe I should do a clean installand then restore my my applications and user data from a backup I will make, however, I couldn't download Mountain Lion because of the problems with the App store (the download stalled at 360k). I know I can download it to my MacBook, but I was wondering if anyone out there has experienced anything similar and what might otherwise be done to fix it.
Thanks,
Erich

Back up all data before making any changes.
Step 1
Take all the applicable steps in this support article.  
Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. Continue if you find that Wi-Fi is faster with Bluetooth disabled.
From that same menu, select Open Bluetooth Preferences. If the box labeled Discoverable is checked, uncheck it. Click the Advanced button, and in the sheet that opens, uncheck the top three boxes, if any are checked. Click OK. Enable Bluetooth and test again.
If the application called "Bluetooth Setup Assistant" is running, quit it.
Step 4
This step will erase all your settings in the Network preference pane. Make a note of them before you begin, and recreate them afterwards. It may be helpful to take screenshots of the preference pane.
Triple-click the line below on this page to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the highlighted line and select
Services ▹ Reveal
from the contextual menu.* A folder should open with an item named "SystemConfiguration" selected. Move the selected item to the Trash. You may be prompted for your administrator password.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Reset the System Management Controller.

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