I am having exactly the same problem.
I have been running Wildfire 1 for years, but only recently I am getting the xtop.exe error message and Wildfire fails to start.
I wondered if it was to do with a Windows Update (I am on Windows 7 64 Bit) .
I have updated the Graphics Drivers etc but cannot resolve it.
It is very frustrating, and as I am Freelance, and am not able to work on my Projects.
Can anyone please help?
Try stripping everything out. Remove all of your config files, except for maybe setting
Change your Windows Performance Options (search at the start menu for SystemPropertiesPerformance.exe) to "adjust for best performance"
Launch the xtop.exe directly from the installation folder (this varies depending on what version you are using)
I have tried your suggestions but to no avail.
I ended up completely cleaning/malware check etc on my machine as I thought I had a virus.
The problem continued.
I have downloaded the latest Creo 3 on a 30 day trial and it works fine, so I guess my old software has had its day.
I have the same error - PTC Creo trial Player with Creo Parametric 4.0 (trial version).
Too fixed I use Windows update for universal c runtime in windows 299226 Windows6.1-KB2999226-x64.msu .
Attention from selection with type of windows use (W 7 x64, W 8 x32, W 10x 64........).
After this update work great Creo - unfortunately I lost 15 day from trial.
All the best,