k, had to crawl a huge amount of historical pages, back to some year 2003 but here is what I found:
Code:

$xK="HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
$cache=ReadValue($xK,"SyncMode5")
$=WriteValue($xK,"SyncMode5","3","reg_dword")


not sure what the values are for disabling proxy and crap but guess you can google with the syncmode5 keyword.
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