We might be able save certain data, but not “everything”. Saving data on a broken computer can be difficult, or impossible sometimes, especially in the instance of Windows/Mac OS reinstallation (i.e. virus issue), or a hard drive problem.
Files such as Documents, Music, Pictures, Videos, Emails might be recoverable, but software programs, settings most likely will be lost. Software programs (i.e. iTunes, MYOB, Skype, Office, antivirus, etc) may need to be re-installed from CDs, the Internet, the same way that you installed them before.
Your old emails might be back, but you will need to re-create your email account settings (email address, password, mail servers, etc). In the instance that Windows/Mac OS need to be re-installed, or hard drive needs to be replaced, it’s not possible to restore your computer to “exactly” how it was before it had the problems. The same applies to transferring data from one computer to another, it is not possible to transfer “everything”.
Keep in mind that it is always your own responsibility to have regular backup of your data and knowing how your programs were installed from the first place so that you can reinstall them later if required (for example, keeping original installation CDs and software licenses).
A good way to understand what can possibly be saved from your computer is to imagine that Windows/Mac OS is your house, your software programs are your furniture, and you may also many customisation, your own setup in that house (your screensaver, background photo, saved passwords, email configuration, settings etc).
When your computer crashes, it means that “house” has collapsed or burned down. We are the builders who help you to rebuild the “house” and salvage what’s left.
It is not possible for us to save “everything” from that collapsed/burned “house”. We can help to rebuild the “house” (Windows/Mac OS), possibly save one or two pieces of furniture (your software programs), but most likely your customisation, setup in the house will be lost (your screensaver, background photo, settings etc). You will need to know how you got the “furniture”, the customisation and setup in the first place to get them again.