My computer info-
AMD A8 1.9ghz
4gb ram 3.45 usable
443 gb free memory
Intel NZ830 2.16ghz
4gb ram 3.89 usable
405 gb free memory
Both running Windows 8.1 64 bit os
What are the properties of your source media (including file extension) and what are you (manually) or the project (automatically) setting as the project preset to match the properties of the source media? What is your choice under Add Media? Is the problem triggered by increased file sizes and the duration of the Timeline? What are you doing in the program when it crashes?
The usual drill
1. Does the problem exist with and without the antivirus and firewall(s) disabled?
2. Are you using a pen and tablet device instead of a mouse?
3. Are you running the program from a User Account with Administrative Privileges?
4. What video card/graphic card are these computers using and is the card's driver up to date according to the web site
of the manufacturer of the card?
Let us start here and then plan troubleshooting strategy accordingly based on your further details of your situation.