Sounds like you really need to brush up on the (complex) subject of color-management.
Color-management involves calibrating and profiling both your monitor and your printer, so that when you think it's purple it really is purple in the file, then so that it actually prints purple.
It's not really possible to teach color-management on a forum, but if you'd like to describe how you're opening your files, what color settings you're using, how you're printing, etc. in some detail, I'm sure there are those here who can help you find particular settings to help you get things done.
What kind of files are you working on? Photos from your camera, designs you make up in Photoshop, ...???
As Noel said, you need to educate yourself about color management on all ends - monitores, printers, document color profiles.
I never had an issue printing before. I printed hundreds of orders without touching a single setting, and everything came out exact. I had a period of time for 2 weeks where I didn't print anything. I go to print something then and have had problems ever since. It's items that I am making in Photoshop. I've used the same exact program for the last 4 years, I just don't understand why NOW out of no where I am having issues.
And I really don't know what color settings or anything I'm using. Like I said, I've always just opened up a new JPEG file at 300dpi RGB and saved the images that way. Then when I'm ready to print, I would just open it up in Photoshop, go to print and change the paper size. Nothing ever had to be changed before.
Then you can't very well expect that anyone would be in a position to help you troubleshoot your issue.
Since you say this started "suddenly", at the very least nuke and reset your Photoshop preferences:
Preferences files vary by name and location for each version of Photoshop. Use this document to find or re-create preferences files for Photoshop CS6.
To re-create the preferences files for Photoshop, start the application while holding down Ctrl+Alt+Shift (Windows) or Command+Option+Shift (Mac OS). Then, click Yes to the message, "Delete the Adobe Photoshop Settings file?"
Note: If this process doesn't work for you while you're using a wireless (Bluetooth) keyboard, attach a wired keyboard and retry.
Important: If you re-create the preferences by deleting the Adobe Photoshop CS6 Settings file, make sure that you only delete that file. If you delete the entire settings folder, you also delete any unsaved actions or presets.
Reinstalling Photoshop does not remove the preferences file. Before reinstalling Photoshop, re-create your preferences.
NEW Video! Julieanne Kost created a video that takes you through two ways of resetting your Photoshop preferences. The manual preference file removal method is between 0:00 - 5:05. The keyboard shortcut method is between 5:05 - 8:18. The video is located here.
Important: Apple made the user library folder hidden by default with the release of Mac OS X 10.7. If you require access to files in the hidden library folder to perform Adobe-related troubleshooting, see How to access hidden user library files.