Hi, my name is Matt and can help you - using Storyline too for 2 years and gathered quite a lot of tips resolving your issue.
It depends on the system you use so please provide more information:
1. Articulate Storyline: version, update (e.g. version 2, update 1).
2. Windows: version and 32/64 bit (e.g. Vista 32-bit).
3. System memory (RAM): amount (e.g. 4 GB RAM).
4. Full and free disk space (GB): amount (e.g. 250 GB, 30 GB free).
I will compile a list to go through (and will help you implement steps, probably only one or few are needed) to let you work without problems. You'll get this list to keep it handy.
Looking forward to your reply,
Matt