yakub268 :
(My laptop isnt my htpc, just used it to show i have a home network)
The desktop (Currently being used as HTPC)
CPU- AMD Phenom x6 2.8GHZ
MOBO- MSI 890FXA-GD65 AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
8GB DDR3 ram
Radeon 6450
250GB HDD SATA II (i think)
750 Laptop HDD SATA II (i think)
HTPC (recycled desktop)
CPU- AMD Athlon x2 3800+ windsor 2.0GHZ
MOBO- DFI cfx3200 m2/g INFINITY
4 GB DDR2 ram
250GB HDD.
Radeon 2400 pro
Router/modem- PK5001Z
speed paid for-10GB
You paid for 10GB ethernet?! Wow...
Assuming that is a typo, which I suspect it is... I do not see anything in your network, or your HTPC that could possibly explain the lots of buffering issue...
As far as to why someone would want to go wired versus wireless. are typically based on reliability, and security. Even with the latest Wireless Encryption, it is a relatively trivial matter to sniff packets flowing through the air and break the key.
Likewise, Unless you are using Wireless N in the 5ghz band only, you will have to deal with the VERY crowded and interference prone 2.4ghz band for all WiFi protocols, A,B,G,N, and even the latest AC protocol. Things like Cell Phones / towers, cordless phones, TV remotes, Microwave ovens, you name it can mess with the signals. The proliferation of CFL lighting and those buzzy transformers doesn't help matters much either. Add tot hat electric motor noise induction, and well... with every single bit of radio interference a radio signal carrying data packets, which is what WiFi is, has to slow down in order for the signals to be sent, received, and understood, and the slowness stacks up. Likewise, your network will only talk as fast as your slowest device allowed to talk to it, which is why I run my router in Wireless N only mode, and have run cabled ethernet to the Wii and PS3.
This sort of communications technology is quite different from a cabled, non blocking switch, where the connection is only slowed down to the slowest device being talked to, so if say you have 4 PCs, 1 with 10/100, the rest with 10/100/1000 adapters, all connected by a 10/100/1000 switch, they will all talk to each other at 1000 except when talking to, or being talked to by the slower machine...
Mind you your HTPC does have a slower disk than is optimal for it if it is SATA II, SATA III (6GB/s) are fairly common these days. If possible you might want to think about swapping the dual drives for a single large SATA III disk.
Now back to your buffering issue. It really does not seem to be a problem with networking unless you are getting extremely poor throughput on your WiFi. (check your speed through your OS).
What software are you using for your streaming server / client? And I hate to even suggest this, but anytime you are dealing with Windows, and slow performance problems you should scan the host for any kind of malware.
And of course do remember that your streaming performance of your internet streams will be limited to what bandwidth you have provisioned from your ISP, and any number of upstream factors up to and including pulling a stream from a slow server...