This is the same problem I have with the latest version 3.21.1767 Have Windows 7 Home Premium 64 bit SP 1, Pentium Dual Core CPU T4400 @2.20 ghz, 4.0 GB RAM,Mobile Intel 4 Series Express Chipset Family
It will hang at 19% then after a couple minutes will increase slowly up to like 23% on System Temporary Internet Files, then take forever to analyze it This has never happened with the older versions & it doesn't clean like before even though I have the same items checkmarked. There has to be a bug causing this. You'll probably say go back to an older version while not explaining, clarifying or fixing the problem