How do you free up Disk Space on a Windows 7 OS?

I've downloaded the sqlexprwt_x64_enu.exe file which was around 700mb and I'm trying to open up the file, but I keep getting the error message of "Unable to find a volume with enough disk space for file extraction".

I've been able to use the disk Cleanup Property to help gain extra hard disk space, but I only have 1.35GB left on my windows 7 partition. I'm unsure which files I can delete to gain more room.

Any tips or suggestions are appreciated.