Deleting installed theme - HELP

[girithaara]

I installed the Iphone theme and Vista theme in my E6, now i want to install new skins and would like to remove Vista skin. How do i delete my Vista skin files so i will have enough space to install new skins?
Can i use Yano My Stuff and browse into ezxlocal/download/theme and delete the folder called Vista which contains iconrez.ezx , Vista.skn and Vista.png

Can I safetly delete this folder?
And yes before i delete this i need to switch to default theme 1st.

[Alpha43]

You installed those with MTF? if you did then you need to d.l the on/off MTF app to turn it off.

~Alpha~

[girithaara]

You installed those with MTF? if you did then you need to d.l the on/off MTF app to turn it off.

~Alpha~

yes wit MTF. So without tge on off mtf i cant delete the folder?