How do I log in to my company network remotely?

You will need to Remote Desktop, first you will need to configure it on your computer at work and home. You might need to request permission from your IT Administrator to configure remote access to your machine.

A Quick Look: Windows 7 in the workplace - Remote Desktop:

http://adacosta.spaces.live.com/blog/cns!E8E5CC039D51E3DB!26595.entry

I have windows 7 Ultimate, how do I log in to my company network remotely?

VPN or Remote Desktop? Both are quite different although you can run Remote Desktop through a VPN tunnel. I think you need to contact the company network administrators for help which depends on what your connecting to, the purpose (ie. Remote Desktop access or shared file/folder/program access) and whether or not your authorized for remote access. Many companines use third-party VPN software for access to their network.

http://windows.microsoft.com/en-US/windows7/Set-up-a-remote-connection-to-your-workplace-using-VPN

http://windows.microsoft.com/en-US/windows7/Why-can-t-I-connect-to-a-network

http://windows.microsoft.com/en-US/windows7/Connect-to-another-computer-using-Remote-Desktop-Connection

http://windows.microsoft.com/en-US/windows7/Why-can-t-I-connect-using-Remote-Desktop-Connection

http://windows.microsoft.com/en-US/windows7/Changing-Remote-Desktop-settings

http://windows.microsoft.com/en-US/windows7/Saving-and-changing-logon-credentials-in-Remote-Desktop-Connection

http://windows.microsoft.com/en-US/windows7/What-is-a-Remote-Desktop-Gateway-server

MS-MVP Windows Desktop Experience, "When all else fails, read the instructions"