Vista - Networking issue

I am having a problem with a vista computer of mine.

A couple of months ago my motherboard went out so i put in a replacement I had and sent the new one off for repair. one Was AMd ( new one ) and one was nvidia. well once i installed drivers for nvidia my driver file got corrupt so I had to reinstall vista luckily I have Drive C: Vista D:random Storage E: Server ( web and email) G: Programs F: backups, movie, music so i didn't lose any games once I reinstalled.

After Reinstall my sharing nolonger worked but i figured it was a nvidia driver problem. I got my new mothboard back and after uninstalling nvidia drivers and re installing AMD drivers I still had no sharing. After checking my Shared files it says i have none even though my printer, and drives e-f are shared. If i try and connect by typing \\Main from any computer including the computer itself it tells me unable to connect but if i type //Main it takes me to the web server I host so I can ping the server but it seems file sharing is broken

without firewall problem still exsist.

What do you get if you type these two commands into a CMD prompt?

net start server

netstat -nao |find "445"


I'm trying to work out whether the SMB Server service on your machine is enabled and listening on TCP port 445, as it should be. It has to process all those share requests, including the ones you initiate locally. If all attempts to access shares are failing, that suggests the Server service is either disabled - or it's cactus for some reason.

I fixed it by reinstalling vista, I noticed more and more programs quit working and i couldn't reinstall the programs leading me to believe my anti virus got corrupted and was not catching viruses. Thank you for your input though.

edit: i have 3 computer that I have tested and i am getting a funny response
Ping results
1>2 timeout
1>3 >28s
2>1 timeout
2>3 >28s

1 and 2 can also not see each other but both can see 3
1 is vista ultimate x64 Sp1
2 is windows xp pro Sp3
3 is windows xp pro Sp3

I also cannot create a network map says response is delayed or incompatible device
I have two routers one wireless b ones wirelessg both are wrt54g linksys routers running dd-wrt v24

its goes modem > Wireless b > computers 2,3,Xbox360, WirelessG
Wireless G> Computer 1

I don't mean to double post but anyone ?