I'm trying to connect to a server at work which is run on a Mac but I have a PC (windows 7) at home. I have path to connect in the format of afp://server.com/files. Is there a client that I need to install on my PC that I can use to login?
Try the usual Windows notation \\server.com\files
If it does not work, and if you have control over the server (can have the admins make changes), on the Mac to got System Preferences, Sharing, then click Options for the File Sharing entry in the list and there enable "SMB Sharing". This will make the Mac share files in Windows style too.
Well, the bad news is windows 7 may not have AFP support - wikipedia explicitly mentions many pre-7 OSes having it, but that server 2008 does not said article also lists clients for it as well.