Simulate IE 6 on Vista

Hi there,
 
I have the following environment:
OS - Windows Vista, IE 7 browser, VS 2008, WebApp being build to asp.net framework 2.0.
 
Everything going fine on the development, except for one thing. The web app layout is all messed up in IE 6, lot's of pages are rendering incorrect.
 
Is there any way I can install IE 6 to teste my layout or use any kind of tool to see each page to check if it'll need to change my css code to work in IE 6??
 
 
 

 
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