Get your taxes done using TurboTax

I keep getting error code 603 that I activated too many times.   This is after using it many times and started inputting my tax info. I uninstalled the download I had done from the disk from costco and downloaded it off the TT website with the activation code I had and got the same error message.  I don't want to start changing all settings on my computer if there's no guarantee it would work.  I have been using TT for many years this is ridiculous and extremely frustrating.  Not sure how to proceed?  TT please tell me how to proceed I'm ready to go pay too much to have an accountant do my very simple/basic tax return forms again and return TT to Costco and never use again.