Good to know the old g router may still be adequate for occasional web browsing. 
No file transfer. But I wish I knew how to, because once in a while I move a video file to a thumb drive to watch the video on a different screen. So for now, the old g may be enough, but soon I will need to upgrade. Thanks for the info.
		
		
	 
The following looks like a long story (it is only 600 words).
   I do not know what the user's overall knowledge is, and what exactly   was already done. Thus the info goes through the motions of configuring   and checking most of the common aspects of Windows OS' LAN features.
 
All aspects should be checked, stating that it
 "worked before" , or persevering on
"I did Not do any thing ", is not a way to deal with 
current Sharing problems.
 ---------------------- 
 Win7 when configured on peer-to-peer Network has 
three types of Sharing configurations.
HomeGroup = Works only between Win 7 computers. This  type of  configuration makes it very easy to Entry Level Users to start  Network  sharing.
Home Network or Work Network = Basically similar(and better) to the previous methods of
 Work Group sharing that let you control what, how, and to whom folders would be shared with.
 Public Sharing = Public Network (like Internet cafe) to reduce security risks.
 For best results log to each computer's System Screen and set all the computers to be on a with the same
 Work Group name while each computer has its own 
unique name.
 
http://www.ezlan.net/Win7/net_name.jpg
 
-------------------------------
Make sure that the Software Firewall, AV, or other components of   Security allow free local traffic on all Networked computers. If you use   3rd party Security On, Vista/XP Native Firewall should be Off, and the   active Firewall has to adjusted to your Network  IP numbers on what is  some time called the Trusted Zone (consult your  3rd Party Firewall  instructions
General example,  
http://www.ezlan.net/faq.html#trusted
Please Note that some 3rd party Software Firewalls/AV/Security suits keep blocking aspects of Local Traffic even it they are turned Off (disabled). If possible configure the Firewall correctly, or totally uninstall it to allow clean flow of  local network traffic.
 If end up with the 3rd party software uninstalled or disabled, make sure that Windows native Firewall is
 On .
 
------------------------------
 
If your network is comprised of Win 7 only and you want a simple Network, use this.
 http://windows.microsoft.com/en-us/windows7/help/videos/sharing-files-with-homegroup
 After configuring the Homegroup scroll down to the 
Permission/Security section.
 -----------------------------
 
Networking Win 7 with other version of Windows as  Work Network (works very well if all computers are Win 7 too).
 In the Network Center, clicking on the Network type opens the window to the right.
 Choose your type of Network. Notice the check mark at the bottom, and check/uncheck it according to your needs.
 
http://www.ezlan.net/Win7/net_type.jpg
 
Win 7 - 
 http://windows.microsoft.com/en-us/windows7/Networking-home-computers-running-different-versions-of-Windows
Win 7  Work Network specific folder sharing - 
 http://www.onecomputerguy.com/windows7/windows7_sharing.htm 
Vista File and Printer Sharing- 
 http://technet.microsoft.com/en-us/library/bb727037.aspx 
Windows XP File Sharing - 
 http://support.microsoft.com/default.aspx?scid=kb;en-us;304040
 In 
Win XP Pro with simple sharing Off,  you can Visually see the Permission/Security setting , and configure them to your liking.
 
http://www.microsoft.com/windowsxp/using/security/learnmore/accesscontrol.mspx#securityTab
 Printer Sharing XP - 
 http://www.microsoft.com/windowsxp/using/networking/expert/honeycutt_july2.mspx
Windows Native Firewall setting for Sharing XP - 
 http://support.microsoft.com/kb/875357
Windows XP patch for Sharing with Vista (Not need for XP-SP3) - 
 http://support.microsoft.com/kb/922120 
When finished with the setting of the system it is advisable to   Reboot all the hardware including the Router and all computers involved.
 -------------
 
If you have Permission and Security issues with Vista/Win7, check the  following settings.
 Point to the a Folder that meant to  to be share. Right click and choose properties.
 In the properties
 
Click on the Security tab shown in the pic bellow to the right) and   check that the users and their permission (shown in the pic bellow   center and left) are correctly configured. Then do the same to the   Permission tab.
 
This screen shot is from Win 7, Vista's menus are similar.
 
http://www.ezlan.net/Win7/Permission-Security.jpg
 In both the Security panel, and the Permission panel you have  to  highlight each User/Group and examine that the Permission Controls  are  checked correctly.
 
When everything is OK, Reboot the Network (Router, and computer).
 
* Note . The Groups and Users shown in the screen-shoot are just an example. Your list will look the way your system is configured.
 
**Note . All users that are allowed to share need to have account on
all the computers that they are allowed to connect to.
 
Everyone is an account, it means a group of all of  the users  that already have an account and been established as users. It  is  available to avoid the need of configuring permission to each on its   own, it does not mean
 Everyone  that feel that they would like to login.
 
