I am running Excel 2010 (SP1) on a Windows 7 computer and if I copy and paste cells that have formulas in them Excel will stop responding and the cpu utilization and memory usage for Excel quickly grows to over 50% and 1gb respectively. If I copy cells that only have text in them I have no problems. I have seen in other posts that Skype can cause this problem but I do not have Skype installed. Any help in resolving this problem would be greatly appreciated.

This is a Windows event log entry when Excel stops responding:

Log Name: Application
Source: Application Hang
Date: 9/19/2012 10:48:43 AM
Event ID: 1002
Task Category: (101)
Level: Error
Keywords: Classic
User: N/A
Computer: abc@domain.com
Description:
The program EXCEL.EXE version 14.0.6117.5003 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 1ddc
Start Time: 01cd9675be7fd99e
Termination Time: 14
Application Path: C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
Report Id: 1807f42f-0269-11e2-bfde-842b2b9ebb45

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Hang" />
<EventID Qualifiers="0">1002</EventID>
<Level>2</Level>
<Task>101</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-09-19T14:48:43.000000000Z" />
<EventRecordID>213831</EventRecordID>
<Channel>Application</Channel>
<Computer>CORP-CGCLPM1.skylinecorp.net</Computer>
<Security />
</System>
<EventData>
<Data>EXCEL.EXE</Data>
<Data>14.0.6117.5003</Data>
<Data>1ddc</Data>
<Data>01cd9675be7fd99e</Data>
<Data>14</Data>
<Data>C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE</Data>
<Data>1807f42f-0269-11e2-bfde-842b2b9ebb45</Data>
<Binary>55006E006B006E006F0077006E0000000000</Binary>
</EventData>
</Event>