Hello and welcome.
1) Uninstall BitDefender. Reboot and install MSE to replace it.
2) Update modem driver:
AGRSM AGRSM.sys Mon Nov 10 09:56:37 2008
3) Update Realtek lan driver:
Rt86win7 Rt86win7.sys Thu Feb 26 04:04:22 2009
Link Removed
1 is the major issue though. Enjoy.