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step-by-step: How to open Excel 2010 files in separate windows in Windows 7

By default, Excel files are opened in a same window in Windows 7. But sometimes you might want to view some files at the same time on your screen. To do this, you can start a new Excel process (excel.exe) by clicking the Excel button from the Start menu.

However, you can configure your computer to always open Excel files in separate windows. We recommend that you only use the method in this article when your computer has sufficient RAM.To have us configure your computer to open Excel files in different windows for you, go to the "Here's an easy fix" section. If you prefer to configure your computer to open Excel files in different windows yourself, go to the "Let me fix it myself" section.

Here's an easy fix

To fix this problem automatically, click the Download button. In the File Download dialog box, click Run or Open, and then follow the steps in the easy fix wizard.
Because the change involves modifying registry keys, the easy fix solution will create a registry backup at your desktop
This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you’re not on the computer that has the problem, save the easy fix solution to a flash drive or a CD, and then run it on the computer that has the problem.

here to download an easy fix to solve this problem.

hmm, if you want to fix it by yourself, give up now, because it is something about code, not hard to do, but complicated. via