Different search results from different pc`s

I cannot understand why this is happening can someone please help me to understand why on 2 pc`s one desktop and one notebook in the same office display different search results on google?
For example type in “wedding album” search australiawide on notebook and we are #1 top of page one on google www.crystalprint.com.au but on my desktop pc it shows the website on page 7 in search results, why is this?
I also notice this for my other websites too.

Because Google personalizes the search results for every user.

Google watches what you do (via your gmail account, your google toolbar, past searches, etc…) and uses those data points to decide what entries to return to you when you do a search.