NEED HELP FAST

I HAVE BEEN TRYING TO FIND A PC FOR MY BEDROOM CHEAP. WITH WINDOWS 95 OR 98 IS OK. JUST WANT IT FOR MY OWN USE MAILY TO ACESS DAVES AND EMAILS. I FOUND ONE FOR $150.00. IT IS A E MACHINE, 98 WINDOWS, PC, CD-ROM, MOUSE, KEYPAD, AND 15 INCH COLOR MONITOR WITH A CANON PRINTER. I AM TOLD IT IS SET UP FOR ME TO TRY. HE SAID IT IS 333 MGHZ. NOT SURE WHAT THAT MEANS. FWHAT SHOULD I LOOK FOR TO CHECK THIS OUT. YOU KNOW WHEN SOMETHING SEEMS TO GOOD TO BE TRUE IT USUALLY IS. I MUST DECIDE IN THE NEXT COUPLE OF HOURS.