So far, haven't yet reproduced the networking issue with my setup:
Host:
NAME=openSUSE
VERSION="12.2 (Mantis)"
VERSION_ID="12.2"
PRETTY_NAME="openSUSE 12.2 (Mantis) (x86_64)"
Linux xxx 3.4.42-2.28-desktop #1 SMP PREEMPT Mon Apr 29 09:18:32 UTC 2013 (a7a14eb) x86_64 x86_64 x86_64 GNU/Linux
Guest: win7 32bit enterprise
WS9 build 812388
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Have you enabled the LSP under VM setting->Network Adapter->Replicate physical network connnection state?