Which Virgin Hub are you using?
If you have a Dual Concurrent 2.4/5 GHz SuperHub2 and can switch your PC to a 5 GHz connection, that might improve matters. Virgin also suggest (for the SuperHub2):
Your Super Hub transmits a radio signal on a particular wireless channel within the 2.4GHz band. If another nearby wireless device (for example, your neighbours’ wireless network) is transmitting on the same channel, the two devices could be fighting it out for the airwaves.
By rebooting your router it will automatically pick the least congested channel, so it’s a good idea to do this every now and again just in case a new wireless device is competing for the airwaves in your neighbourhood.