Runas will work. There are two ways to do this.
1. Right click on Internet Explorer, click on runas. Enter in your administrator credentials. When IE launches, type in my computer in the address bar, and whamo you have a Windows explorer box with your credentials.
2. Open up a command prompt and type this:
runas.exe /env /user:username "start c:\path to folder\"
Replace username with your administrator account name and replace path to folder with the path to the folder you want to open.
When it prompts enter your administrator account password and you'll be set.