Windows/Installer is almost 90GB

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Dec 27, 2011
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Hello, my c:/windows/installer folder is approaching 90GB on my 120GB SSD, which means with the rest of windows and a few programs I have <100MB of free space left. I need to know the best way to clean this up or if I can delete it all or what.
 

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I can just move the entire folder to my HDD without any problems? And from now on will it continue putting those folders on my HDD? And I've heard deleting it can cause problems when installing/uninstalling/patching, is that true?