Hello.
Ive been using XP pro 32bit/Ultimate 64bit + CCleaner for meny years and its been working good for me. Now i installed the new Windows 7 64bit Ultimate, and made all the updates and basic settings + networking ok. Then i downloaded the latest version of the CCleaner, did registry cleaning. Restarted the machine... No go. The bios got stuck (yes i have the latest bios update installed). Must klick the powersupply off, and do the normal start. Then it worked ok. And again tried restart = same problem. Network machines were not shown. It couldnt even see itself anymore, only the modem/router.
Fortunatelly i did remember backing up cleaned CCleaner registry stuff. So i opened the machine again and restored the cleaned registry files, and guess what? Restart and network works again, with no problems. So i dont recommend using CCleaner with Windows 7 64bit Ultimate, before this broblem is solved.
I have 5 PC:s and every machine has the same installation. I tried the CCleaner with my other PC and at first it looked ok, but after 2 or 3 restarts the bloody thing couldnt find the hard disc anymore. I told me, that in the system files hal.dll is corrupted or missing. Only after many different starting manouvers i got windows to start an tried repairs, with no success. I googled it up, and many people had these hall.dll problems after using different registry cleaner products. I allso find out that the windows 7 doesnt use that file at startup???
I'm not shure if that is correct/true, but enyway. CCleaner has big broblems ahead, if you cant Check/fix this up soon. I allso recommend that Priform team should CLEARLY show/announce at piriforms homepage, wich programs are compatible, or are not compatible with certain windows versions. I didnt find any compatibility lists at your homepages.
I had to format and reinstall the whole system again. No broblems so far and both of my machines work now 100%. I will not use the CCleaner again nor recommed it to anyone, before you can make shure it wont mess up things in the windows 7 the same way again.
Thaks and cheers!
PS: I'm new here and i dont visit (any)forums very often. So this is mostly information for the development team and replys wont reach me any time soon. I really hope you can fix this thing.