Before I try this what does this meen
Warning: Undefined variable: combostrings in C:inetpubwebwwwrootubbubbaccel_test.php on line 124
Your PHP version is 4.06: OK
Your PHP version has zlib: No
Your PHP version will have no issues with the UBB Accelerator. There does not appear to be zlib support in this PHP version. The UBB Accelerator will be unable to use zlib compression.