vitog

Alan, Most of us posting to these sight are admittedly not computer gurus.If you want to try to assist those of us that are having problems you may want to lose you superior attitude.

Andavari, Thank you for your assistance. I was able to install it using the information you provided. Have a great day!

Thanks for the jargon filled response. Here is what I did: Downloaded the software from the Piriform site (one time from Filehippo) and clicked install or run. So now, please, explain, in plain English, how this is my fault. Thanks.

Thank you for your assistance. First of all let me say that I have been using Ccleaner for many years and have been extremely satisfied - up til now. I took you advise and uninstalled the old version. Having the same problems when trying to install. Now I have no Ccleaner. I have been using PCs since the 80s when they came with only 2 5" floppies. I have never had to install software in safe mode. Frankly this is not worth the trouble. Send me an email when you correct your programming issues. Thanks again...

Cannot install 5.02.510 on windows 8.1 64 bit. Checked task manager and closed ccleaner. Tried once to run from the site with IE and once downloaded and ran using Firefox. In both cases I received the error message, " Windows SmartScreen prevented an unrecognized app from starting. Running this app might put you pc at risk." I chose "run anyway". Then received, "NSIS Error. Installer integrity has failed." I am reluctant to uninstall the old version. I had the same problem when I initially installed the program, so I downloaded the program to a flash drive using a different PC than installed on this PC. Do not particularly want to do that every time I need to upgrade. Your assistance would be greatly appreciated.