Is the warranty of my internet connection Windows 7 undermined by having my local network Windows XP connected with off ICS?

My Windows 7 connects to internet via my Android phone - sometimes using WiFi Hotspot of the phone and sometimes by direct USB connection between them.

My Windows XP is often connected to my Windows 7 in a LAN network two computers [no router involved] or the Ad Hoc WiFi connection.  Internet connection sharing is off in Windows 7 so that Windows XP can not connect via the internet.

Currently, I disconnect the two computers when the Windows 7 to go on internet.  Am I being too conservative?  Could I just leave the two computers when Windows 7 is on the internet, given that ICS is off?

[modified to improve clarity 23 Sep 2014]

Hello

Sorry for the late reply. I wish to inform you that hackers cannot attack your computer if Internet connection sharing is disabled on the computer. No one can access your computer while you are connected to an active internet connection.

Please post back if you have problems related to Windows and we will be happy to help you further.

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