Its very easy to Remotely access Home PC or any other computer remotely without direct physical connection. It just need that all the computers you want to access should be connected to Internet (Broadband for better access).
There are various softwares that provides Remote access. Just download from sites given below.
I personally feel Logme in is easy to use, just create an account, download and run.While you will run Logmein will provide you the you computer name. Just save that you might need it later.
Install both Logmein both the PC's (Home and Office).Go to the Desktop Sharing Tab and click on send an invitation button to trigger a mail from home to email id that opens at office. and provide a sufficient link activation time. Just click on the link sent on your id from OFFICE and enjoy access. MAKE sure HOME PC should always be up.