Free Trial has expired?

[Setari]

OS: Windows 7x64Bit
Video Card: AMD(ATI) Radeon HD 7900 Series
Memory: 12 GB RAM
Monitor Resolution:1920x1080
Video Editor: N/A
Game Problem: Program Problem, can't get it to launch. Keeps saying my key is expired even though I just downloaded the free trial. I have never downloaded the free trial on this Windows OS.
Video Type: N/A

[radi]

Are you the only user of your PC?

[Setari]

Yes, I am. I may have previously installed a free trial of Action! a number of months ago and uninstalled it wrong. How can I clear my PC of all Action! files? I tried messing with the registry but it doesn't seem like that's the issue, since I deleted any Mirillis Action! registry keys I could find, or I am pretty sure I did.

Edit: Your support team said I had to reinstall Windows. So... I guess never mind, I'm not doing that.