That depends what server is in use. I guess it will be Openfire, from the same developers as Spark. It will run on Win7/2008R2 x64. Next you need to know what database is in use. If it is an embedded one, then you can just move the files to the new server and it will work. If it is not, you will have to dump the database, or of the database is sitting on some other server, just point it to that server on the new Openfire server. Check the Openfire installation folder and if it has "embedded-db" folder, then it uses that database. If you are using LDAP integration, then it becomes more tricky, can't help with that, but probably it still would be enough to copy /embedded-db and /conf folders to the new machine.
A hint: do not install into Program files on Win7/etc. Install into C:\Openfire