What is my best bet?

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Hi:

We are small company with 4 computers. One of them is a file server running
windows xp pro sp3. All other machines have win xp pro installed as well. We
notice slow down in file accessing time if we don't restart system every two
or three days and also windows xp firewall causing problem. In order speed up
the file access we have to shut down the firewall otherwise to access
QuickBooks file takes long time to open. Once we close the firewall file
opens in 5 seconds with firewall on it takes over a minute to open.

My question is if we upgrade from windows xp to windows 7 64bit or windows
SBS 2003 which will be best choice. Currently, I can buy SBS 2003 on eBay
for $280 and Windows 7 64bit for $250. Not to mention windows 2000 server
very cheap on eBay. We are just using as a file server not any other
services. However, I prefer secure remote connection so can login from home
time to time.

Machine has 4 gig ram DDR2 and dual core 2.1ghz processor, Gigabit LAN.
Thanks for your input.
.

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