Hi and welcome to TSG,
You might have a 'hung' openoffice process. Press the keys Shift + CTRL + Esc simultaneously to bring up the Task Manager. On the Processes tab, look for processes that begin with soffice. End those processes and then restart OpenOffice.
The data recovery software only activates when you click 'search' or 'recover' and direct it to whichever device you're working on. These programs don't work like key-loggers recording every character you type. Some may come with their own uninstaller, or use the Windows 'add/remove program'...
If you have the installation disc for Microsoft Office for your old machine, check the licence. The discs I've used allow up to three machines for 'home use'. A free & legal alternative is Open Office which is compatible with Microsoft Word, Excel etc.
I use Excel at work and then tinker with...
Support for Ubuntu 14.04 ended last year so you might be better off trying a new DVD/USB install of a supported version anyway. Support version dates at this link: https://www.ubuntu.com/info/release-end-of-life
I think most Ubuntu releases now are too large to fit on CDs but will fit on DVDs.
Was it system recovery or system restore? The two are different as explained here: http://www.differencebetween.net/technology/software-technology/difference-between-system-restore-and-system-recovery
System recovery resets the pc to default factory settings.
Microsoft don't call people. If this person calls back, just say you're not interested and hang up. Don't let them install anything on your machine.
Have a read of this example: http://www.actionfraud.police.uk/news/watch-out-for-microsoft-scam-calls-to-fix-your-computer-jan15
If you're worried...
I see you are getting help here: http://www.tomshardware.co.uk/answers/id-2753585/acronis-macrium-reflect-backup-truecrypt-file.html
You've also posted in BleepingComputer.
As to the last question. The 100gb is the size of the True Crypt container that you created, it won't expand but will...
You have asked in the Linux and Unix forum. Linux systems don't have a "system restore" in the same manner as Windows. In Linux you can use such progs as 'TimeShift' etc. but they're not generally installed by default.
Are you running Linux? If so what back up prog did you install?