I installed windows 98 updates and it upgraded outlook from version 5 to version 6. Now all my emails and attachments are gone :( . Does anyone know how I would recover the emails and attachments ?

While upgrading from an older version to a new vesion of outlook you should have opted to keep the existing folders rather than creating new ones when prompted. You should have made a back up disk for your old mails to get them back easily to your new outlook folders. I assume that you have no back up disk. Your old files might be stored in one of your folders in C:\ with a .pst file extension. Check and try if you can import those mails to your new outlook (file menu > import export).