Hi. Been having this problem for a while. Running Windows 7. The C:\ drive available memory just keeps getting smaller over time. Now down to a MB or two or sometimes down to zero. Moved some files to my D:\ drive last weekend and got 1GB of memory back on the C:\drive but it has leaked over the past week and I'm back to just a few MB's. I haven't saved any files or documents on the C:\ drive in the last week so I don't know what's sucking up the memory. I have tried restarting, Disk cleanup, Defragging, deleting temp files, all to no avail. Have Webroot installed and working and have also run Malware Bytes, Avast and TDSSKiller and all have come up empty on viruses (doesn't mean I don't have one though, just that they can't find them). Ran CHKDSK and it tells me that all my available memory is about gone - yep, I knew that. Moved my System Restore to the D:\ drive a while back. Large files other than Windows 7 on my C:\ drive are in the Apps\osmedia\sources and Users\(local name of my computer file)\appdata files, which are already compressed. Really stumped how to fix the problem. Have plenty of RAM available but real problems now that the C:\ drive is so low on available memory. Any ideas how to fix this problem? Thanks for any assistance.