The HWIDs from that driver are...
PCI\VEN_8086&DEV_27C3&CC_0104 is supported by D\M\I4 ICH7R/DH - 82801GR/GH
PCI\VEN_8086&DEV_2652&CC_0104 is supported by D\M\I2 ICH6R - 82801FR
PCI\VEN_8086&DEV_24DF&CC_0104 is supported by D\M\I1 ICH5R - 82801ER
PCI\VEN_8086&DEV_25B0&CC_0104 is supported by D\M\I1 ESB - 6300ESB
at least four different drivers might match the HWIDs from that OEM IASTOR.inf file
however HP states that is is a 945GM Express Chipset...
Google tells me 945GM uses ICH 7...
I will Guess that
PCI\VEN_8086&DEV_27C3&CC_0104
- ICH7R/DH
- 82801GR/GH
is your HWID...
currently supported by 909r6 in D\M\I4 iastor Version 8.9.2.1002
the version of iastor from your download is Version 5.5.0.1035
That version is the same version as in D\M\I1
Could you try moving your HWID from D\M\I4 to D\M\I1 (section [I4] to section [I1]) in the DriverPack_MassStorage_wnt5_x86-32.ini file and testing?
Note PCI\VEN_8086&DEV_27C3&CC_0104 is actually supported by all four folders I1, I2, I3, I4...
1 is oldest 4 is newest....
It would be nice to use the latest driver that works...
so if you were in a really really good mood you could try them in reverse order
by moving the HWID to each of the appropriate sections in the mass INI;
I4 we already know fails
I3 ?
I2 ?
I1 ? - Should definately work since it matches with your download from HP