[Windows] Should I format my hard drive?

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http://ubuntuforums.org – I really messed up and I need help. I have both Windows 8 and Ubuntu (I think it's 13.04). When I bought my PC, it came preinstalled with Windowss 8. So, while I was using Windows, I deleted a graphics card driver I thought was useless. Turned out I needed it, and now when I try to boot to Windows from the boot menu/screen I see the blue Windows sign and a spinning loading animation. Once it goes away, my monitor flickers every 2 seconds from no input to the default black screen monitors show when they aren't showing anything. I used Ubuntu for a while. I thought I was smart enough to figure o (Hardware)