Cannot Delete Text By BackSpace

Today I have many problem with Office = =".
I can't delete selected Text by press BackSpace It only move text cursur to left = =".
Then I set

1. On the Tools menu, click Options, and then click the Edit tab.
2. Click to select the Typing replaces selection check box, and then click OK.

Thanks to
http://support.microsoft.com/kb/901124

Some Office bound window into one main window

In task bar found 2 process but can only open in 1 window (cannot simultaneous display 2 windows).

To solve this issue.
Only Choose

TOOLS --> OPTIONS -->VIEW TAB and put a check in the option that says "Windows In Taskbar"

Regards,
Rollinnow you can simultaneous open 2 window .

Details from
http://forums.techguy.org/business-applications/589241-excel-multiple-windows.html

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Lastly After I test again.
I can't open 2 work (from link of file that have data) in separate window except
I open new blank worksheet then It will show in new window.