memory leak from all windows 7 processes


I recently changed the hard drive of my laptop. The problem I saw with the new OS is that all the processes of Windows 7 that run in the background shows increase in their memory usage over time. For example, dwm.exe starts off with around 45 mb which increases to 80mb with an hours use. All other processes show that same signs. I haven't run my laptop for more than an our so I don't know how long will it take before there is a 90 and 100% use of the memory. I tried reinstalling windows 7 without avail. Can anyone tell me what's happening and refer to possible solutions?

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