Hi Ginger334:
I'm not a computer expert and I've never run Vista on a VM so I might not be of much help to you, but it sounds like your
Windows Experience Index scan (Start | Computer | System Properties | Performance | Rate This Computer OR Start | Control Panel | System and Maintenance | System | Check Your Computer’s Windows Experience Index Base Score) is getting stuck on the
graphics test for Windows Aero performance.
Are you able to run WinSAT or a Windows Experience Index scan if you
disable Windows Aero as instructed in the Intel support article
Frequently Asked Questions for Windows Aero and the January 2013
Disable Aero on Windows 7 or Vista (or Windows 8.x, Sorta)?. Aero adds special graphics features to windows (e.g., translucent title bars, 3D effects, etc.) and consumes a significant amount of system resources on Vista (see the Jan 2009 Petri article
Aero Theme is Bad, Disable It ) and there might be a problem with the amount of RAM, GPU, etc. you've allocated to your VM or how those resources are configured.
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ASIDE: IF you aren't a regular Vista user just note that Microsoft deactivated the Windows Update servers on August 3, 2020 for computers with unsupported Windows operating systems like WIn XP and Vista that do not support SHA-2 code signing - see the Microsoft support article
Windows Update SHA-1 Based Endpoints Discontinued for Older Windows Devices. If your Vista OS is not patched to end of extended support (11-Apr-2017) this means you will not be able to use Windows Update to install the ~220 security updates released between May 2009 (the release date of Service Pack 2) and April 2017.