It is normal to sit at 90% for quite a while during the R80 postinstall wizard but it should eventually finish. Unless you have at least 4 cores and 8GB of RAM on that server though it can take a LONG time, and anything with 2 cores or less and/or 4GB RAM or less is not a good idea for R80 Management.
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My book "Max Power: Check Point Firewall Performance Optimization"
now available via http://maxpowerfirewalls.com.
Gaia 4.18 (R82) Immersion Tips, Tricks, & Best Practices
Self-Guided Video Series Coming Soon