Most likely the issue is known and has a solution. Search Google for the 3rd party program behavior or error messages you have in a virtual machine. ( Virtual Machine > Configure… > Options > Security > check on Isolate Mac from Windows) Isolate Windows from Mac to exclude Mac OS X influence. A program designed for Windows XP and Vista may not work in Windows 7 virtual machine). Make sure the virtual machine with the 3rd party program meets the system requirements of this 3rd party program (pay attention to Operating System.
The issue is not reproducible under another Windows user account (another point for corrupted or misconfigured Windows virtual machine). The issue is known in the Internet and forums and has common solutions. 
The issue is only reproducible in a particular virtual machine, and this program works fine in another virtual machine, so most likely your initial virtual machine is misconfigured or corrupted. The particular scenario does not work on physical computers (PC) either (not only in your Windows virtual machine). Most likely the issue is not Parallels Desktop related if: There is a functionality issue that affects only the particular third-party program (mouse does not work, graphic issue). The issue is reproducible on all virtual machines you have and you were able to reproduce it in your test environment. How to know whether the issue is Parallels Desktop related or not? Most likely a third party software issue is Parallels Desktop related if: If you have some problems with this third-party software it is reasonable to contact this particular third party software vendor and dedicated Technical Support first. It means all the third party software you install inside your virtual machine is supposed to operate the same way as on a real PC. 
This operating system would operate in most cases the same way as if it had been installed on a regular PC. Parallels Desktop allows installing an operating system (e.g.
Some its functionality does not work as expected. Quickbooks, AutoCad etc.) on your Windows virtual machine and you experience some issues using it: You installed a third-party software (e.g.
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