On our HP Pavilion z4230 laptop - whenever my wife goes to run CCleaner, she gets a Runtime Error right when it hits 43% completion. As soon as you hit "OK", it shuts the program down. This just started happening the other day. I had her download and install a copy of the v2.19 program, but that didn't help other than now the error stops it at 40% completion vs. 43%... She's running XP Home, SP2, with the Firefox 3.0.10 browser. Yesterday's description details of the problem starts with: "The thread attempted to read from or write to a virtual address for which it does not have the appropriate address" CCleaner v2.18.878... I checked Virtual Memory settings and the minimum is set to 1437MB with the max set at the same (per prior tech advise here), due to the memory/runtime error problems we were having a few weeks ago. At that time we cleaned out about 6 MB of files to open up a total of about 11MB out of the 30MB on the HDD and the problems seemed to go away. Thought that would be enough... Any ideas? Thanks.