Installed Nvidia Driver = Taskbar Shrunk & K Menu Taking too long to launch

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http://forums.fedoraforum.org – I installed Nvidia drivers for my GTS250 card by reading instructions in this thread. Since I have 4GB of RAm, I decided to install the PAE Kernel on my system. After rebooting I was prompted to choose between Normal Fedora 12 & the Fedora 12 PAE Kernel. I booted into normal but it could not detect my Full HD monitor & so it ran at 1280*1024. So I now get black space on all sides of the screen. After that I booted into PAE kernel. Here everything seems to be fine except that the taskbar has shrunk. It now covers only around 60% horizontal area while the rest is left blank. Also the 'K' Menu takes around 10-15 secs to open upon clicking on it. How do I remedy them? (HowTos)