Mystery computer shows up under Shared list in Finder

I’m hoping someone can help me solve a mystery…I have 2 macs (a late 2008 MBP and the most recent white MB), both connected wirelessly to a Time Capsule. From time to time, I see a computer show up under the list of Shared devices that I cannot identify. It is listed just as a MAC address and looking at Get Info tells me it’s a PC server. I have no other computers or devices connected to my network. and I also have the network protected with a password. I even changed the network password this morning, and the mystery computer still appears and disappears at random. When it does appear, I can connect to it as a Guest, but there are no folders or other content available.
Can anyone suggest what might be going on? I’m concerned that my network is compromised and that someone else has access to my files. Should I be worried and how can I fix this?
Thank you!

+*When it does appear, I can connect to it as a Guest, but there are no folders or other content available.*+
+*Can anyone suggest what might be going on? I’m concerned that my network is compromised and that someone else has access to my files. Should I be worried and how can I fix this?*+
It's more likely that you are seeing someone elses computer that may have sharing enabled. If you are in an apartment building or have neighbors otherwise close-by, you may just be picking up their machine. Because you see theirs does not mean that they can access yours in anyway. HOWEVER... if you see a machine appear under your shares (or otherwise) that you are not familiar with, you should NOT attempt to connect to it. Doing so could potentially compromise your system. It's not very likely... even less likely on a Mac... but it is something to avoid.

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    2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.
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    4. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode, under the conditions in which the problem is reproduced. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
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B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D22 0 $((N1+4)) 5 4;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;A1 4 19 11;B4 0 0 44;C3 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&D22 11 17 17 20;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 52 0;B4 0 5 54;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 52 6;B4 0 7 54;B3 4 0 22;A3 14 6 52 0;B4 0 8 54;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;A2 4 20 21;B7 6;B2 9;A4 14 7 53 9;B2 10;B6 9 10 4;C3 25;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 53 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;A1 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&D13 21 0 32 19;D23 14 1 48 42;D23 14 2 48 43;D13 14 3 49 5;D22 4 4 50 0;D13 4 5 32 1;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D23 22 9 37 7;B1&&D13 10 42 32 40;D23 20 42 32 41;D13 25 37 32 33;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;D22 32 31 43 38;B1&&for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;B1&&D22 29 35 46 39;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-  
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