very odd problem with gmod

i have played gmod on 3 different computers in the past month on 2 of them it worked fine. I am using an hp mini now and I have two
addons. the addons worked fine on my 1st computer i didn’t get them on the second but they are from the same guy and have not been reported. I have the following credentials:
processor: intel® atom™ cpu n450 @ 1.66ghz 1.67ghz
windows 7

Uh, maybe I missed something, but what exactly is the problem?

He didn’t actually make it clear.

your computer probably isn’t good enough, hell, you didn’t even list a GPU or mobo.