1. Do you have any third party antivirus or security program installed on your computer?
2. When does this error message occur?
This issue occurs due to the antivirus software present on your computer and also the less system cache.
As a test you may consider disabling security software on your Windows 7 machine and check for the issue.
Turn windows firewall on or off
Disable antivirus software
Note :Enable all security software after the test.
If the issue gets resolved then I suggest you to follow these below steps.
a. Click Start, Run.
b. Type "regedit"
c. Set the following registry key to ‘1′:
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\LargeSystemCache
d. And set the following registry key to ‘3′:
After making these changes, restart your machine.