It's possible that the malware you discovered damaged Word and/or other system files. Since you have an installation disk (which I'm guessing is Microsoft Office 2010), I would uninstall the entire suite. How to uninstall or remove Microsoft Office 2010 suites
After uninstalling Microsoft Office I would check for damaged or corrupt system files by running a system file checker scan from an elevated command prompt (option two.) If problems are found, run the scan 3 times and reboot the computer after each scan. SFC /SCANNOW Command - System File Checker
Since you know the computer was previously infected, it's very possible that other malware is still lurking. No anti-malware product is 100% effective 100% of the time. If there was such a thing we'd all be using it. Besides running Malwarebytes again, run some additional free
on-demand scanners. My first choice is Windows Defender Offline. It's a bootable media which means it has to be made on a machine that is without malware. And some other free scanners. WDO ESET Online Scanner TDSSKiller Trend Micro HouseCall SuperAntispyware
If all of the scans come back with no threats detected, I would next do some general hard drive housekeeping. Disk Cleanup - Open and Use Disk Defragmenter - Open and Use Hibernate - Enable or Disable
(If you don't use hibernate)
Once all of this is done, reinstall Microsoft Office. Please post back if you're still having "not enough memory or disk space" issues.