First, I will admit to not being an expert on this...but to give you an answer until someone else comes along...
I assume that since you mention mint4win, you have "installed" Mint through Windows. You are really at the mercy of Windows for your Mint experience, as mint4win is allowing you to run Mint from that other OS. So, you should not be surprised to not have permission, as the other OS has the permissions!
If you wish to have a better Mint experience, then start the livecd and install Mint in a dual-boot. You will have a new limit, in that you will have to choose your OS to work in at boot. (i actually did this for six months, before I realized that I rarely booted into Windows. I have been Windows-free for four years)
For greatest security, and greatest overall usage, it would be better to let Mint take over the whole hard drive, and then install windows as a virtual machine. (Assuming you need Windows for some special programs, games.)
Of course, don't do any of the above without first doing a backup of your data!!
Malachi 3:10 NRSV
...says the LORD of hosts... I will not open...windows...for you...
Linux user since 2001 pda; 2006 lappy