WinCC V7: Tip#1 WinCC Explorer - server not available. How to fast solve this problem in WinCC V7?
Check :
1. SQL instance (WinCC) if running
2. Set AUTO mode instead of manual
3. Start SQL Server (WinCC)
ps. in more problems go to users/groups in control panel and find if you have enough rights to use SQL Server.
After checking the SQL service and permissions, continue with a structured introduction to WinCC project work. See the curriculum and sample lessons in the WinCC V7/V8 Basic Training (Level 1).