Hello Takeo,
As you can see from Apples Support Article RE:
Zapping the PRAM, in no way should you have lost any of your mail .... even your web browser bookmarks shouldn't have disappeared! Sorry to hear about this.
Can you retrieve your mail from your ISPs webmail or were you using POP account types?
Have you ever ran First Aid in Disc Utility in the past, or recently to verify/repair your Disc/Permissions? You can even boot from your install media and run Disc Utility from there which is sometimes necessary.
How much free space do you have on your Hard Drive? At the bottom of any Finder window you can see all available disc space.
What version of Mac OS are you running? Do you connect to the printer wirelessly or wired? Was the printer directly connected to your Mac? What brand is the printer?
Have you tested your other USB ports
(if wired) or have a spare USB printer cable around to test?
Have a look in:
System Preferences ~> Print & Fax ~> Printing and see what it says for installed printers.
Have you tried to add the printer (if it doesn't show in System Prefs, that is) using the Printer Setup Utility
(in Applications ~> Utilities?