‘Windows XP Mode’ could not be started because there are not enough system resources or memory in your computer. You can shut down other virtual machines or close open applications and try again.
If you’re running Windows 7 and try to install Windows XP mode, you might run into the error “‘Windows XP Mode’ could not be started because there are not enough system resources or memory in your computer. You can shut down other virtual machines or close open applications and try again.”
You’ll need to find the app causing the problem. You can use msinfo to figure out which apps are resource intensive.
- Click Start, click Run, type msinfo32 in the Open box, and then click OK.
- Expand Software Environment, and then click Running Tasks.
- View the values in the Min Working Set and the Max Working Set columns for each process to determine the process that uses a lot of physical memory.
Actual Cause
In my case, I discovered Stardock Tiles and Virtual PC are not compatible. Kill the Tiles process and you’ll be able to run Virtual PC. You can run Stardock Tiles after loading up Virtual PC though.
Update 3-23-12
A few people (Thanks Tom!) have commented on the issue and have pointed out for them that Google’s CrashHandler process also interferes with Virtual PC. You can either kill it through task manager or disable it completely by doing the following:
1. Open Google Chrome
2. Go to File Menu >Options
3. Click the tab Under The Hood, and uncheck the option which says – Help Google Chrome better by automatically sending the usage statistics and crash reports to google
Did you know…?
Windows 7 sports tons of new features and surprises that have gotten little to no fanfare.
Did 
you know that Microsoft has updated the Windows Calculator with Windows 7 with some really new and useful features? Previously, most of these features often required you to open Excel or use some website to solve the problems they address. The calculator sports new features including Unit Conversion, Date Calculation, Mortgage, Vehicle Lease, Fuel Economy (in both MPG and KM no less!) You can find the different options under the View menu after opening the calculator up. See screenshots below for examples of what the calculator can do.
{Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}
Problem
If you’re working in ASP.NET and ever ran into the error:
{Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}
You’ll probably find that the stack trace gives you no useful information as to where the error actually occurred.
The Solution
For Response.Redirect, use the overload function (Response.Redirect(String url, bool endResponse)) and pass false into the EndResponse parameter:
[csharp]Response.Redirect ("nextpage.aspx", false);[/csharp]
For Response.End, you’ll need to call the HttpContext.Current.ApplicationInstance.CompleteRequest method instead of Response.End to bypass the code execution to the Application_EndRequest event.
Details
The error occurs when you use Response.End, Response.Redirect, or Response.Transfer.The Response.End method ends the page execution and shifts the execution to the Application_EndRequest event in the application’s event pipeline. The line of code that follows Response.End is not executed. This problem occurs in the Response.Redirect and Server.Transfer methods because both methods call Response.End internally.