Here're what they are:
After clean install WinVista Ultimate x64, some unkown folders appear on desktop. I believe they are some GUID numbers, but I have no idea why they are there for.

Total Commander 7.0 pb2 clearly shows these folders, but Windows Explorer won't show them even after enabling hidden and protected system files to be displayed.
Also, at this time, I have some issues with softwares that I install:
1. When using WinRAR 3.62 (install, run WinRAR self-extracting file), WinVista prompts application compatibility warning.
2. I cannot copy and paste file(s) from Total Commander 7.0pb2 to Windows Explorer (such as desktop) or drag and drop and vice versa.
However, after I play with WinVista quite a while (surfing, installing softwares, and so on), from some point, mentioned folders are gone.

I have no idea how or why.
And after they are gone, WinRAR compatiblity warning are gone, and now I can copy and paste or drag and drop file(s) from TC to explorer and vice versa.
But, after I clean install WinVista again, I see mentioned GUID numbered folders again.
Does aynone know what's going on?
Thanks.
Sang