C Drive space issue on is one of the most common problem I have come across. Basic History/ Temp file deletion are most common tips to help and at one point we may need to do something beyond that, analysis of files/folders which are taking more space is the requirement when I use to get stuck at.
For last few years, I had been using WinDirStat (http://windirstat.info/) to identify which files can help me gain more space. This is a very useful tool which can be used on any drive and at folder level also.
If this is not solving your problem, next possible option is to change the partition settings to get some more space from other drive which on the same disk.
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