Unable to connect to Windows XP machine

I have a peer-to-peer network with 4 XP machines and 3 WIndows 7 machines.
I have one XP machine that was slow accessing the Internet with both Internet Explorer and Firefox. And we are unable to ping the workstation from other computers.
BitDefender was installed, and its firewall service was on.
It appears the BitDefender found a virus several days ago.
Tested Internet with and without BitDefender firewall enabled - definitely working much better with firewall disabled.
We saw that the profile for the firewall was set up as "Remote", meaning that most services inbound would not work. Changed to "Trusted" settings and tested IE again. Now works same as when it is disabled. Left as disabled for now.
Troubleshooted inbound network communications. Not a duplicate IP issue, ARP table shows proper entries for the workstation. IP address is 192.168.0.245, MAC is 00-1e-4f-d6-90-12.
Attempted to restart Windows Firewall service - cannot start service, missing dependencies.
Reset TCP/IP stack - no change
Uninstall/reinstall network adapter and restart - no change.
Attempt sfc /scannow on PC - receiving error and unable to run, says that RPC connection unavailable.
Uninstalled BitDefender on the chance that it is causing issues. - no change
We installed Microsoft Security Essentials for the time being.
We are still unable to "see" this computer on the network or even ping it. We are able to see it in our modem/router's device table.
Any ideas?
lyonskiAsked:
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comfortjeaniusCommented:
Try to reset the TCP/IP Manually

netsh int ip reset c:\resetlog.txt

Reset Your Winsock Manually

netsh winsock reset


Are the NIC drivers up-to-date?

Try uninstalling the NIC drivers, restart and allow windows to auto-detect the drivers.

Plus since you stated that you had a virus a few days ago, try to use Malwaebytes to see if everything is remove. Your antivirus will not catch everything.

http://www.malwarebytes.org/

Plus you can try Hitman Pro

http://www.surfright.nl/en/downloads/

Try to run adware cleaner as well

http://www.softpedia.com/progDownload/AdwCleaner-Download-212632.html
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lyonskiAuthor Commented:
I ended up using Microsoft Support to fix many services. They also found additional spyware, Trojans, and other issues. A lot of Windows components were damaged and ultimately they suggested a rebuild/repair of Windows XP.
Thank you for your help.
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