Start is back uninstalled. Now computer has issues

[Saintzer0]

The 30 trial expired for Startisback. So I uninstalled it from control panel. Ever since my computer becomes unresponsive after a few minutes.
After a Google search I tried reinstalling it to use some built in uninstall option. I did not see one. I tried killing the task in task manager then uninstall. Same result
I'm not sure what I am missing here. Could any of the customer theme programs be dependant on Startisback?


(Edit)
Now when I boot computer it's a black screen. The beep from booting sounds off. But it remains a black screen
Any help would be appreciated. Thank you

(Edit)
Managed to boot after holding shift + restart. Deleted all registry entries and restarted. So far so good. I'll report back if anything else happens