Open Control Panel → Programs → Turn Windows features on or off. Check .NET Framework 3.5 (includes .NET 2.0 and 3.0). Click OK. Windows will download necessary files from Windows Update.
This fixes 70% of these errors by forcing SolidWorks to recreate default settings.
Warning: Editing the Windows Registry can harm your system if done incorrectly. Follow these steps precisely. error cannot initialize library solidworks 2012
Perform these steps in order. Start with the simplest (restarting) and move toward more technical solutions (registry editing).
Antivirus software often quarantines or blocks SolidWorks DLLs during loading. Disable real-time protection completely (disconnect from the internet first), then launch SolidWorks. If it works, add exclusions for: Open Control Panel → Programs → Turn Windows
The error "Cannot Initialize Library" is a generic initialization fault. It usually points to one of three main culprits:
Corrupted user profile can cause this. Test with a fresh local admin account. Corrupted user profile can cause this
If a specific library is named in the error (e.g., swloadersw.dll), you can manually fix its registration:
regsvr32 /u "C:\Program Files\SolidWorks Corp\SolidWorks\swloadersw.dll"
regsvr32 "C:\Program Files\SolidWorks Corp\SolidWorks\swloadersw.dll"
Also check that PATH environment variable includes:
C:\Program Files\SolidWorks Corp\SolidWorks and C:\Windows\System32
Before diving into the solutions, it is helpful to understand why this happens. The "Cannot initialize library" error usually points to one of the following issues: