Do you have your SSD in one of the red SATA ports and have you set AHCI in the BIOS for the SATA ports?
Did you reboot after installing RST?
Run AS SSD Benchmark (you don't have to run the benchmark) and in the top left it should say “iaStor”.
Yes, I have 3 drives 1 SSD and 2 conventional drives which are all plugged into the red ports. BIOS is set to AHCI and I did several reboots. Actually the system is up and running - but on msahci drivers and not the Intel RST which I would prefer.
Installing the RST won't change the current msahci to RST however as if it does not install properly. Strange thing is that there is no error message though, installer runs through and tells me to reboot. After reboot there is no change which is weird.
The “msahci” in windows 7 supports TRIM you don't have to change it.
Try changing the AHCI to RAID in the BIOS as TRIM is still supported in RAID for a single SSD and even if your not doing RAID it will still work for single drives.
Solved the problem in the meantime by trying to install the new RST 10.0.0.1046 WHQL. Install went smoothly and no errors so far with my Vertex 2. Thanks nevertheless.