I think I installed windows 7 twice

It has been a couple years since I have installed win 7Pro and I do remember doing something incorrectly on the first installation, and having to install it twice. My 80GB ssd is running out of space and I was wondering, If the OS is indeed installed twice; can I delete the duplicate. I ran WinDirStat and it shows that the Windows folder is using 29.7GB(is this excessive?).

I have made some room on my ssd by disabling hibernation, and transferring my downloads and documents to an external hdd. I was just wondering if I could remedy this without performing a clean install of the OS.

HAHA I'ma noob. I didn't know there was a difference between temp internet files and temp files, but I just got an additional 4.75gb of free space.

Not unless it is hidden and I have to do something special to see it.

Yes. Approximately 30GB

Set paging file to System managed: Virtual Memory Paging File - Change - Vista Forums

Use CCleaner to keep the temp files cleaned out. I also trust its Registry cleaner.

Other tips in Troubleshooting Steps for Windows 7, Clean Up Factory Bloatware and Optimize Windows 7 - Windows 7 Forums