Incoming connections blocked?

Hello, about a week ago I started experiencing a problem when trying to connect to my friends gaming servers (this may need to go in the gaming section but I think the problem is deeper than that. We use hamachi to avoid port forwarding, firewall issues etc and that refuses to let either of us ping each other, if I try to ping his public IP in CMD it works but if he tries to ping me he gets request timed out. I think the problem is with incoming connections to my laptop. It isn't network specific either as I've tried it on 3 different networks. To summarise, it seems to be any incoming connections are seemingly blocked/ not recognised by my laptop.

What I've tried to fix it:
-Disabling firewall and anti-virus
-Re-installing Hamachi
-checking for network adapter driver updates (None found)
-Trying to connect on different networks (Same problem)

I've had the problem for about a week and its driving me insane! Usually i can fix problems with windows but not this one so any help is massively appreciated


Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 32 bit
Processor: AMD E-350 Processor, x64 Family 20 Model 1 Stepping 0
Processor Count: 2
RAM: 2667 Mb
Graphics Card: AMD Radeon HD 6310 Graphics, 384 Mb
Hard Drives: C: Total - 152621 MB, Free - 5492 MB; D: Total - 152219 MB, Free - 57261 MB;
Motherboard: TOSHIBA, PWWBE
Antivirus: AVG Anti-Virus Free Edition 2012, Updated and Enabled