Please help. I've screwed my PC up trying to mine Quark Coins.

I was attempting to FOLLOW instructions on the following youtube line:

http://reviewoutlaw.com/how-to-start-mining-quarks-bitcoins-mining-the-simple-guide/

The instructions are pretty simple and nothing should have gone wrong in theory. I was ABLE to set up my Quark Wallet and install the mining tool as instructed.

However, after mining for a whole day or two, I had picked up no coins, so I gathered that either I have made a mistake in pasting my Quark Wallet address, or maybe I'm too late in the game and there are no more coins to be had by using a home PC.

My inclination was for the FORMER, as I am visually impaired and use a screen reading SOFTWARE to access my pc and it is highly likely that I could have made a mistake in pasting the address.

Anyway, I was trying to stop my pc from running the mining script but could not do so. And in the process, I ended up changing the mining tool's settings from 'Start when Idle' to Start when not idle'. Or at least that's what I think I have done.

I have since then deleted the whole folder that contained my wallet. But the issue is that every time I try to use my pc, the cpu goes insane. This is especially the case when I am using the internet. I think the mining script is running even though I have deleted all the related folders. And now I can't stop it at all.

Please, please help.

Mind you, my PC runs on Windows 7. Also, I've gone into system config and tried finding a process in startup but could not find anything out of the ordinary.
When looking at task manager, which process is eating up CPU resources? Is this the program you had or a virus etc? If you know the name of the program that is doing this we will be able to better assist you.