Rollback to Plesk 7.5.4

[Kmurray]

hi guys ive just upgraded to Plesk 8 but i get this error at the login page:

ERROR
StatInfo->getProductVersion failed: file_get_contents() failed:
0: /usr/local/psa/admin/plib/common_func.php3:25 psaerror(string "StatInfo->getProductVersion failed: file_get_contents() failed: ")
1: /usr/local/psa/admin/htdocs/login.php3:28 getProductNameVersion()

I have no idea what this is.

Can someone please tell me step by step (im a newb btw) how i rollback to plesk 7.5.4 please, im in desperate need of help

thanks