Internet slow and wireless connection keeps dropping

So, my iMac crashed and I had to reinstall. That really sucked.
Pre-crash I was amazed by the speed and reliability of my internet connection. We're talking girlish glee.
Post-crash/reinstall, my internet is a plodding monster that takes forever to load simple websites at times and drops the connection a couple of times a week.
Can anyone help? I'm assuming it's a software issue since my wireless connection was fast and reliable before reinstalling.

Hi,
If you are still having problems.......
I'm assuming it's a software issue since my wireless connection was fast and reliable before reinstalling.
Try changing the Airport channel.
Open AirPort Utility (Applications/Utilities)
Select the device you’re setting up on the left and then click Manual Setup. Enter the base station password if necessary.
Click AirPort in the toolbar, and then click Wireless.
Choose a new channel from the Channel pop-up menu.
If that doesn't help, on your iMac, go to /Library/Preferences. Move all the files in the System Configuration folder to the Trash, restart the iMac.
Carolyn

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