This problem typically occurs on computers running under the Windows XP 64-bit edition.
The error occurs because Windows Installer does not have enough virtual memory to verify that the TestComplete installation package is signed correctly.
To resolve the issue, configure Software Restriction Policies to allow Windows Installer to verify installation packages of any size:
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On the computer where the problem occurs, run Local Security Settings. To do this, click Start | Run, type
secpol.mscand press Enter. -
Select Security Settings | Software Restriction Policies in the section on the left.
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If no Software Restriction Policies are defined, right-click Software Restriction Policies and then click New Software Restriction Policies.
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In the section on the right, right-click Enforcement and then click Properties.
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In the Apply software restriction policies to the following users section of the Enforcement Properties dialog, select All users except local administrators.
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Click OK to save the changes and close the Enforcement Properties dialog.
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Restart the computer in order for the changes to come into effect.
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Try to re-install TestComplete.
After installing TestComplete successfully, set the value of the Apply software restriction policies to the following users option back to All users.
