SKY BROADBAND/LAPTOP ISSUES?

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Hey there, I am at my wits end with a technical issue I am currently having and was hoping some of you tech gurus out there might know whats wrong. I am not tech minded so I will explain in points instead of a long winded story.

1 Installed SKY Hub a month ago in my flat. TV Phone and unlimited broadband.
2 Engineer did a signal check after install, reading was excellent.
3 My mobile connects to the network as does my PS3, again both give excellent signal readings.
4 Both mobile and PS3 work perfectly on the network.
5 Laptop connects to network and gives excellent signal reading.
6 Laptop will not let me go online, UNABLE TO ACCESS INTERNET OR UNABLE TO CONNECT TO NETWORK
7 Sometimes it goes ok for a few minutes then one of the above comes up!!!
8. I use google chrome, I can access the internet on my laptop everywhere else without issue except for my flat which is extremley frustrating so I know its not my laptop.
9. Sky keep telling me its excellent signal strength.
10. Before I climb a watch tower does anybody have any idea what might be causing this? Any input welcome