What about files such as the 170 files with names similar to "Perflib_Perfdata_148.dat" and the various one in the sequence "JET4DFC.tmp" -- is it safe to delet them? And then there are all those "JET4DFC.tmp" files. I deleted most of these files once and ended up with nothing but trouble.
Additionally, if I'm running the Indexing service, there are thousands of 16-byte Hex-numbered folder names. Last week I deleted 19,700 of those sucking up a couple of GBs. Doesn't windows have some way of automatically removing them as the indexing moves to "completion?"