SBS 2011 C drive out of space

We have a SBS 2011 the C:\ drive is 159GB and is constantly out of space.  Last night we had 8.6GB available this morning 117MB.

I'm using WinDirStat and looking for file we can remove to free up space.

I've already dumped many of the common logs you can delete safely.  Looking for a more aggressive way to deal with the space issue and also what is constantly taking up the space.  

The exchange store's are on the D:\

All log files that can be moved the D:\ drive are already moved.

Please advise, email isn't routing.
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Nick RhodeIT DirectorCommented:
What about WSUS store and file store.  Do those still reside on the C drive?  You can also look at using treesize to get a better idea of what is chewing up all your space.
Alan HardistyCo-OwnerCommented:
breynolds01Author Commented:
I believe all the WSUS files reside on the D:\ as well.  I'm installing the TreeSize now.  Will update.
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breynolds01Author Commented:
14.6GB  - winsxs
112GB   - winevt  c:\windows\system32\winevt
1GB       - c:\windows\system32\
3.4GB    - Assembly c:\windows\system32\assembly

Can I safely delete the winevt files?
Jason WatkinsIT Project LeaderCommented:
I'd clear out your event logs (winevt) and then figure out why they are filling up so much.
Nick RhodeIT DirectorCommented:
Those logs are safe to clear:

I would then investigate as to why those are filling up

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