after maybe 5 minutes of gameplay my pc restarts this doesnt happen in any other game just stronghold crusader has anyone a solution?

Games restarting my PC usually means RAM memory gone bad. Try a different game for a longer continuous time, maybe?

Also, call GOG's support.

The place to start is to Google how to make your operating system give you error warnings instead of restarting. You need to find out what is going on.

A restart like that is generally a hardware fault, but sometimes software can be blamed.

Once you know what is causing the problem, let us know if you have more questions.

I've been having this problem, it seems whenever I build walls where a unit suddenly can't get where he's going, the game just gives up and hard crashes