I installed an 128gb SSD in my laptop and installed windows 7 in UEFI mode. Because my laptop originally came with a 32gb ssd cache the hard drive mode in the BIOS was set as 'Intel Rapid Response' and i forgot to change it to AHCI before i installed windows. Noticed this mistake today but after changing to AHCI (or ATA) Windows would no longer boot and give me a BSOD. I spent ages trying to fix it and eventually had to reinstall the 32gb cache ssd temporarily just to get the Rapid Reponse option to reappear in BIOS and activate it. Anyway. How can i repair my windows installation to boot in AHCI? Ive tried the old activating ahci post install trick and that didnt work. Many thanks for looking.