Computer won't start after downloading coupon printer

Hi,

Apologies in advance for my elementary tech speak.

I downloaded a coupon printer from Catalina Marketing and after printing it, my computer wouldn't shut down and after a forced shut down, it won't start up, it just goes to a black screen where my cursor is visible.

I am running Windows 7 and WebRoot software. Are there any other programs that I should mention that would help narrow down the problem?

My dad normally helps me with this stuff but he is on vacation and I am desperate for some help. I just want to uninstall this program and have my computer start up again. I knew that $10 gift card from Target wasn't worth the hassle downloading this coupon printer has caused me. Any help would be great. Thanks in advance.
 
That WebRoot software is old and you probably paid for it too. You are infected by malware. You may need to download and run Microsoft Security Essentials. Can you get into the Safe Mode by pressing F8 repeatedly as the computer starts to boot?
 
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