It could be that your hard drive is damaged, or that there are errors on it. Try running Check Disk, and set it to fix file system errors and scan for and attempt recovery of bad sectors.
If that doesn’t work, then install PowerArchiver to a different directory and try again.
Also, you could try installing it to a removable drive - in that way, if no errors are found, the hard disk is damaged and needs to be replaced!
The RAM may be faulty - remove a module at a time and try (the most common cause of blue screens is faulty RAM!).
Since it also happens at work, the above may not work. If that’s the case, try these:
Run PowerArchiver in Safe Mode. Does it still happen?
Try reinstalling Windows (try over the existing installation first, and then a clean install).
Run it in compatibility mode.
I know it’s extreme, but maybe it’ll work! PowerArchiver may have its bugs, but it’s still the best archiver I can recommend!