" ... it went daft and removed parts of the windows program and I could not get the machine working at all without putting in the Windows disk and running that and even after that the only way to get the machine to work was to replace the hard drive and start again."

NOT doubting that your installed copy of Win7 broke, and assuming the hard disk wasn't the problem, roughly 30 minutes to an hour spent backing up the system with Macrium Reflect [Free or paid], plus roughly 30 minutes to an hour restoring that backup, would have saved the hours it can take to install Win7 + all the available updates. If OTOH the hard disk coincidentally failed, it would have been easy to restore that backup to a new hard disk.

Otherwise very much doubt that Advanced SystemCare Pro removed any Windows system files. I'm Not saying that running it didn't break Win7, but rather if the app was at fault, the problem was *likely* driver related. FWIW, if Win7 will run at all, a repair install will most often fix it.

Zeyu, check the text at this very page:

"NOTE: The Pro version is activated with the provided giveaway license."

Activate the key in the Readme, and it switches to Pro.

Van, Where can I get the giveaway license? I pressed Download Now, but i didn't get the license...

Ok, nevermind, i didn't check properly the zip file, I found it, thanks.

Donald Hanson, I guess you have not tried the win 10 built in cleaner, it cleans 10 times deeper than ASC, please try it, you can find it under win administration-drive cleaner system software, it cleans all of the temps, all of the previous win OS installs, all of the applications temp files, all of the old back-ups and much much more.

"... the win 10 built in cleaner, it cleans 10 times deeper than ASC... it cleans all of the temps, all of the previous win OS installs, all of the applications temp files, all of the old back-ups and much much more."

Sorry, but Windows Disk Cleanup [it's in Win7 - Win10] will delete *many* of the files in the 2 Windows temp folders, but not all of them. It will *often* get rid of old *stored* driver files -- the old version after a driver update -- but not always. It will delete *some* Windows Update related files after an update or patch has been installed, but performance is uneven -- using it on 2 copies of Win10 will not have the same results. It will not completely get rid of browser cache & similar files. It won't touch the registry. It will not clean up the Windows\ SoftwareDistribution\ Download folder, which can grow to over 1 GB. It will get rid of the files saved in Windows-old -- those files necessary for a roll back -- after upgrading a full Win10 version [not the smaller cumulative updates like the one coming soon].

You can run Disk Cleanup from the 1st tab of properties after right clicking a drive/partition in Windows Explorer, or from Control Panel -> Administrative Tools. In that case the 2nd tab of the Disk Cleanup pop-up will let you delete old restore points. In Win10 you can access the same cleanup process via Settings -> System -> Storage, and Settings -> System -> About for deleting old restore points.

Gabor , As a programmer myself I would say it's probably because each of those programs also create temp files (for statistical uses) and are left behind when you shut the program off because there's no way to clean up after themselves.

"Whatever sequence I use it the next will find new temps to clean, reg to repair, etc. Why it is so?"

RE: Temp files, some require admin authorization, some require taking ownership, some are in use so can't be deleted, some are likely created between the time you ran one app & then another. That said, it's trivial to clear out Windows 2 temp folders yourself. One's located in C:\Windows, the other's in Users\ [UserName]\ AppData\ Local\.

RE: The registry, it's in constant use, so it's contents change constantly as well. Registry cleaning &/or repair typically means searching for orphans -- entries that reference or link to something that's not there -- and possibly some more or less tweaks that the developer(s) have included in the app. Since there's no set procedure or guidance from Microsoft, it's up to the developer to decide what's safe & what's not -- cleaner X *may* be more aggressive than cleaner Y.

"Cleaning TEMP files does not create more disk space... they get recreated the moment you open an application... just wearing the hard drive is not a solution." "... the registries have no influence on your computer speed, unless they are corrupted."

Sorry, deleting 1GB worth of files Does free up 1GB of space. There's no way of getting around that. Some apps do create temp files when they start up, some do not -- some will delete them when they're shut down or closed, and some will not. While it might make some sense to not bother with temp files that will just be recreated, that doesn't address driver, app, and Windows updates that are only ever run once. RE: Hard disks & SSDs, you're not normally talking about loads of extra wear when you clean the temp files once a week or once a month. In theory, the more temp files there are, the less efficient a conventional hard drive will be after a defrag -- with an SSD you want to keep drive storage below the 50% mark for best performance. RE: Registry size, in *extreme* cases it can noticeably slow things down, because its contents have to be read into memory to read/write. But I stress Extreme -- I've seen it on copies of Windows that are 6-8 years old that have been migrated to 3 or 4 PCs with loads of software installed & uninstalled. Note also that it takes deleting an enormous number of registry entries to put a dent in the registry's total file size.

Hi Paul. I requested the email link too and all went well including my first scan. It looks like a good program and worth the effort for you to try again (perhaps download a fresh copy?). Good luck.