Is there any of the factory software that came with your laptop you use. If not, then clean install with an ISO of 7 home premium (bit specific - 32 or 64). This will install only the OS and not any of factory bloatware that comes with it. You can download the ISO from here.
Official Windows 7 SP1 ISO from Digital River « My Digital Life
Remember to download all your drivers for your laptop and to include any software that might be viable... ie, for a built in webcam.