tried system restore point and it tells me that no changes were made ran defraggler again,
DO NOT BELIEVE IT.
Depending on your unknown O.S., files that were defragged may have been added to the CURRENT restore point,
and System Restore will still show that last Restore Point as having the original date and time at which the R.P. was created with the registry snapshot.
WinDirStat is available from PortableApps, but unfortunately,
1. It always launches with a TEMP executable that is always random ;
2. Comodo Behavior Blocker queries whether I want this unknown thing to run,
queries three times as it does various dodgy things including the running of Reg.exe.
Comodo learns so it does not have to ask the next time I run it,
but the next time it gets launched with a different name and Comodo has to start all over again.
Regardless of whether you go for the Installed version or the Portable version,
I believe it will give a choice of analyzing ALL partitions or simply one.
It takes very much longer when doing more than one,
the 6 GB used in C:\ is swamped by the 120 GB in other partitions.
Last night I needed to compare 6 GB in C:\ with last month's "golden snapshot" image in R:\
Since WinDirStat uses the registry there would be total chaos if I ran two instances for comparing R:\ and C:\
I used the ZIP portable version of TreeSizeFree.
TreesizeFree can only do one partition at a time, but what it does it does well.
Because there is no registry aggravation I ran two instances.
Comodo Behaviour Blocker had seen me use it before and did not flinch.
I could then immediately seen where the major chunks of bloat had appeared.
I now always prefer TreeSizeFree over WinDirStat, download from
http://www.jam-software.com/freeware/index.shtml
Regards
Alan