I have my primary laptop running Win7, and a mini laptop (11"), that I primarily use when I travel, running vista. I prefer Win7, but I prefer Vista to XP for sure. Each are stepping stones.
Unless you need something out of Works that it cannot do, I would not fret about the upgrade. If you are having trouble with works you might try OpenOffice (openoffice.org). They offer free downloads of software that works much like MS Office, and they work great. Personally, I prefer Open Office to Works. But whatever gets the job done for you is what counts.
A side note: Works documents do not convert easily to other formats such as doc or docx (MS Office) or Open Office extensions. You might recall a member of NCT had all their recipes in Works and could not find an automated way to convert thousands of recipes to a more standard format such as Word or Open Office.