Win7 system can not open new tasks after upgrading VirtualBox. Error code 0x80004005

Some users have added Win7 virtual system under Win7 due to work needs. With the update of VirtualBox 4.326, users have also started to upgrade. After the upgrade, a user finds that the originally created virtual machine cannot be opened. The prompt message is: Cannot open a new task for the virtual computer win7, error code 0x80004005. The following small series introduces the solution. First, the reason analysis: through the system log analysis, the problem is locked in the win7 system's theme core file "uxtheme.dll", in fact, the user restores the cracked win7 system theme core file, you can open the virtual machine. Second, the solution steps: 1, to the Internet to download unsolved Win7 theme core file "themeui.dll", "themeservice.dll", "ldtheme.dll", three files; 2, under WinPE will be three The above files are solved by overwriting the files to the C:\\windows\\system32\\ folder. The above is the solution to Win7 can not open a new task after upgrading VirtualBox. If you encounter the same problem, you can refer to the above method to solve.