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Hi Leon,
I take it that you tether your laptop off your PC (ie connect to your WiFi via your PC by using some kind of share)?
There could be a few reasons this happens:
1. Nearby WiFi users are using the same channel as you which effectively "chokes" the signal;
2. If you are going via a shared network connection on your Desktop, check that the firewall is not restricting access;
3. Per the above except check your virus scanner (Norton / McAfee's are notorious for eating system resources, which would slow any connection down);
4. I think you said this, but reboot your router - switch it off and leave it about three minutes (so it picks up a new IP from your provider) and see how that goes;
I bet it's the first as it happens intermediately which is typical when two folks near each other use the same channel. If you're mates with your neighbours - might be worth asking them what WiFi channel they are using. Even if a different channel if your all on an older 2.4GHz band, then it will slow down if your all wanting to use the same bandwidth at the same time. An option would be to change channels or if possible both the channel and go to 5Ghz.
I am guessing a fair bit here based on the info provided.
Hope that gives you some ideas to play with.
Pete
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