About the Pins....
RAM Modules will come in 168pins, 184pins, and 240 pin Modules. 168 is SDRAM, 184 is DDR RAM, and 240 is DDR-2 RAM
also , you might want to consider the " Speed " of the module
open everest , click motherboard, then click spd look at the Memory speed , EG: PC3200
as for question 1.
try this , right click on my computer , select properties then click the hardware tab , and open the device manager
is there a yellow exclaimation mark on the network adaptors , click to drop the drop-down menu and right click on the device ( if any ) and select properties and check the device status
as for quest 2 , if there is no problems with the moniter , leave it
and as for quest 3 , is your internet slow ??? , and is your computer connected to multipul computers ???
IF NO , leave it
Somone else may have another opinion , but i dont know alot about it ( so i wouldn't suggest to enable it (Enable IP header compression to increase network speed) )
maybe google it and see if it will be of any benifit to you...
Good luck with the issue
sorry about sloppy post ( iam in hurry lol )
Thank you for your time