I have a TZ170N that came with two gigabytes of ram.
The TZ's real limiting factor is that it uses the ultra low voltage pentium m processor.
You can try getting a Windows Vista install CD and use the license key on the bottom and call...
First you have to get the hinge caps off.
Wedge something made from a softer spatula that is somewhat wide into them and follow their edges until you hear them make a click noise to know you got the clips out in order to slide them...
On the bottom:
Remove 2 screws in the back on the outer edges (back being battery area).
Remove the two flat screws where the battery goes.
Remove the silver round headed screws along the battery connector.
Remove the ram cover, and...
First try this:
Look in the lower right of the task bar for an icon with two arrows on it.
Double click it and VAIO Smart Networking will pop up.
Click the box for WLAN and see if the light on the switch on the palm rest turns on.
Go to www.sony.com/support and grab the shared libraries driver and notebook utilities. SmartWi is useful if you plan to use the sprint card or turn the bluetooth off but it sometimes causes .net runtime crashes.
The best way to go is make sure you get 2 gigabytes of ram.
The faster CPU doesn't make a huge difference.
The best performance boost you will get is if you wipe the hard drive and kill the hidden recovery partition. Next, use a vista...
You have the 945GM chipset. You can download the driver there and install it onto your system to get it updated. All Sony does is release these very same things bu with a check in...