I will address the OP question of what can cause a corrupt profile.
1. Turning the power off without shutting down Windows.
2. Turning the power off without shutting down Windows.
3. Turning the power off without shutting down Windows.
4. Maybe a hard disk issue.
5. Turning the power off without shutting down Windows.
In all seriousness, that is about it!
Skipster67, you don't have a corrupt profile. I would check your machine for a virus. Freezing and dropping off, as you say, are indicative of a poorly running PC.
Steve