1) With regards to W7 vs. W8: Either you trust this person who told you that it wouldn't work or you don't. If you trust their word then stick with W8 if you want to find out for yourself then try installing it.
2) With regards to trouble-shooting your printer issues: What most often works for me is copying the error message into my search engine and scanning results until I find something. If I know the search is futile I'll start from the last place that worked. In your case the last place that worked was well... But you could try 1 step back and reinstall the printer driver.