These types of errors like “Restart Computer Fail”  are occurred when we try to install SQL Server 2008 Developer Edition. Trying to install SQL Server 2008 Developer edition setup failed at the Setup Support Rules page on the Rule "Restart Computer" see figure 1. The following error message appears on the screen: "Restart computer failed" see figure 2.

Figure 1:

Figure 2:

Error Reason: In general, a previous program installation created pending file operations on the installation machine.

Solution:

Step 1: Open the registry. For open registry, press window key + R and type

Step 2: Type Regedit and press enter button

Step 3: Now

selectHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

Step 4: Double click "PendingFileRenameOperations"

Step 5: Delete all data from the Value data textbox.

Step 6: Press OK and close the registry.

Now try to run the SQL Server 2008 setup again. I hope Restart computer failed error not come again.