Request Timeout's and brief connectivity drops.

For a week now ive been experiencing connectivity drops that will knock me out of games or just simple web surfing for 10 seconds at a time. At one point it could happen twice within 5 minutes or be fine for 15 minutes straight but its random and annoying as hell. This is only happening on my computer not any of the others on the network. I am the only computer who has a static connection the reason for this port forwarding for game server creation.

I can ping default gateway ex. 192.168.1.1 -t in cmd and will get a mix of results as followed:
bytes=32 time=-385ms TTL=64
bytes=32 time=385ms TTL=64
bytes=32 time=385ms TTL=64
bytes=32 time<1ms TTL=64
bytes=32 time=-385ms TTL=64
bytes=32 time=385ms TTL=64
bytes=32 time=-385ms TTL=64
bytes=32 time=-385ms TTL=64


Then will receive a request timed out for 3 or 6 lines.

During the request timed out session I am still successfully pinging the loopback 127.0.0.1 .

Here is the list of what I have done thus far.
AMD Athlon
Windows XP Professional.

1. Scanned for viruses using (malwarebytes, combofix, tdsskiller, and superantispyware. All came back clean.
2. I've never installed any realtime antivirus protection so nothing to uninstall/disable there. However, I did disable Windows Firewall.
3. Uninstalled and reinstalled my onboard NIC adapter with new drivers.
4. Installed an additional PCI NIC card with current drivers.
5. Replaced Cat5 cable coming from my NIC adapter to multiple router ports.
6. Setup a Static IP address and switched over to dhcp.
7. Disabled under power management for NIC "Allow the computer to turn off this device to save power".
8. Cleared the ARP cache, Created a new Host file but the old one looked fine.

 

Are you running wired or wireless? First step is to establish whether the problem is between your PC and router or router and internet. I suspect it is the former as you are having problems pinging router. Might be worth resetting your router to factory defaults, removing and recreating you network connection and starting afresh.

edit: as you have tried replacing CAT5 you are using wires! my bad.

 

Try changing your router's IP range.
Instead of it being 192.168.1.1, try something like 192.168.38.1, set your static to the same range and change the DHCP server function to also be in that range. I have had this happen when a second device on the network has a default IP of the always popular 192.168.1.1