Help, Comodo literally made my computer unusable

Please help. I just wanted an antivirus so I installed Comodo, and all it did was make my laptop really slow. It didn’t even let me run my usual windows products. It wouldn’t let me even uninstall it, so I tried to do a system restore and now my laptops screen is just black. And the caps lock button flashes every second or two. Any suggestions?

First you need to supply information as to what Windows version you have, the make of computer, amount of memory, type of CPU, any other security products installed, and possibly what graphics card you have.

And maybe also which version of Comodo ? v5 , 6.3 , 7beta ?

Is it possible to get into Windows Safe Mode? If you can run this clean up tool.