Comodo detects new network: Is this safe?

A few days ago, I was expecting my ISP to significantly upgrade my connection speed. At midnight, Comodo detected a new network. I allowed this, thinking it was part of the upgrade. Sure enough, the upgrade had been implemented. Is this usual for a cable modem?

Today, I deleted a folder of files. I used DataRecovery (DR) to undelete a few but DR also found numerous strange files such as:
sxproxy.dll
syskey.exe
sti.dll
ssshim.dll
sstpsvc.dll
systray.exe
sysntfy.dll
sysclass.dll
sxstrace.exe
sxproxy.dll
SubRange.uce
streamci.dll
systemcpl.dll
TabbtnEx.dll
TRACERT.EXE
thumbcache.dll
termsrv.dll
tdh.dll
tcpmonui.dll
tdh.dll
tcpmib.dll
webcheck.dll
url.dll
vss_ps.dll

There were multiple instances of each of the above files. The original location, supposedly, was my folder but this is not possible. An AV scan found nothing.

Can anyone throw any light on this? Thanks in advance.