Did you add any new hardware or software to your system before you noticed this problem?
When you startup in regular mode, right-click on My Computer, go to Properties, go to the Hardware tab, and click on the Device Manager button. Scroll down to the Network Adapters section, click on the plus sign on the left side of it, and look for a red X or an exclamation point next to the network card.
Open up My Network Places, on the left side of the window click on "view network connections". Under the Local Area Connection icon, what is the status? Connected? Disconnected? Disabled? Aquiring Network Address?
When you startup in regular mode, right-click on My Computer, go to Properties, go to the Hardware tab, and click on the Device Manager button. Scroll down to the Network Adapters section, click on the plus sign on the left side of it, and look for a red X or an exclamation point next to the network card.
Open up My Network Places, on the left side of the window click on "view network connections". Under the Local Area Connection icon, what is the status? Connected? Disconnected? Disabled? Aquiring Network Address?