If it's VC++ errors then try:1. Check if u have installed Microsoft visual c++ redistributable on your system best if u have couple of them from different years of release.2. If u have windows 32x version, and if u have 4 or less gigabytes of RAM u might have to unlock your RAM limiter.Reference link on how to do it: https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-enable-a-3GB-switch-on-Windows-Vista-Windows-7-or-Windows-XP-s.html3. If all of it fails turn of antivirus, download dragonica client again, install it, update, and launch it. With turned off antivirus all this time.4. If that's still didn't help you, then: a) reinstall your windows because it has way too much trash in it. b) buy new PC...