I would not have any installed Google programs as they are spyware that paste interest ads. Same for staying signed into any Google site.
I only use the stable Google search box built into Firefox or IE9 which won't allow it to spy.
Most tech enthusiasts prefer to Clean Reinstall - Factory OEM Windows 7
to have more control over what's installed and how they configure and use their OS. Everything you need is in the link.
Please answer Ignat's questions just above so we can help you better.
In addition if you want to post back a screenshot
of your maximized Disk Management drive map with listings, we can help you sort out what is worth keeping and not. Just type Disk management in Start search box above Start button.