Well,
If your computer shares are accessed remotely, I guess you've got your security not set tight enough. It seems you've gave the group "Everyone" rights on your shares and NTFS access rights.
This way it's very hard to control who accesses the shares, and Windows doesn't have an option build in (I know of) that can log these connections. Like /JD sais, you'll need a network sniffer to log this.
Better just to tighten your security, so only authenticated people can access you shares. And then Windows has got it's own logging mechanisme: auditing. You can configure it so every connection made to any share will be logged in the auditing logs. Be carefull though not to log to much; your machine will be busier logging things thaen actualy serving shares
Hope this helps.