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Sounds like you have some spyware or malware installed. Try running Malwarebytes and scan for any malware. You can get it from [url]www.malwarebytes.org[/url] It has saved me some trouble many times. Let me know if that doesn't work.
In addition to mjdodd's question, Is there a software firewall on that third computer?? I have seen a software firewall block communications between computers.
I would also check to make sure that one of your "windows" keys is not stuck. it is the key with the windows logo on it.
Greetings, One thing that was not mentioned was is there a Gateway in the TCP/IP properties for PC1 and PC2. If this setting is incorrect on one of the PC's the ping reply will not "know" how to get back to PC2. They should be the same on both PC's.
Greetings, One thing to try is to "clean up" your system. Run things like Disk Cleanup, scandisk and disk defragmenter. And also make sure you have plenty of Hard drive space and available RAM memory. Hope this helps.
The End.