I don't know if this will help anything, but I just found out about the SUI (I only thought that all we had were "skins"!), and got the following results on my latest "Quick" Scan using SUI, and only asking for a Scan of the Hard Drive:
Number of scanned files/folders: 96,822/19,877 (NOTE: I didn't check the box for any "folders" to be scanned.)
Runtime of last scan: 00:21:38 (Hardly a "Quick" scan to my way of thinking.)
Number of infected files: 0
Total size of scanned files: 18.8 GB
I don't if this information helps anybody with anything, but I thought I'd post it, since the scan time is approximately the same as it took me to do a "Quick" scan with a skin, and it would therefore seem to me that skins therefore probably have little or nothing to do with the problem.
Remember, I'm not that computer-literate, and perhaps I've contributed nothing!
Good luck finding out what's wrong!