Can't get HD Tach to work on Vista

I downloaded the latest version of HD Tach a couple of weeks ago, but dialogue box popped up giving me this error message, "Designed for Windows XP or 2000 Only!" or words to that effect. Vista comes right back and says, "Did the program install correctly?" or words to that effect. I answer no, and then HD Tach installs and works nicely

Since then, I formatted my drives, reinstalled Windows, and downloaded HD Tach again, get the same error message saying that HD wasn't designed for Vista, but now Vista doesn't ask me, "Did this program install correctly?" and now HD Tach won't work

How anyone come across the same thing and how do I fix it?

Vista 32bit | Core 2 Duo E6600 | BFG GeForce 8800 GTX | Patriot EP 2X1GB PC2-8500 DDR2-1066 CL5-5-5-9 | 3ware 9650SE-4LPML RAID Controller with BBU | 150GB Raptor x2 RAID 0 - OS/Swap | 150GB Raptor x2 RAID 0 - Data | 150GB Raptor - Backup | SB X-Fi XtremeGamer Fatal1ty Pro Series | Dell E207WFP & Samsung SyncMaster 213T | Asus Striker Extreme | PC Power & Cooling Turbo-Cool 1KW-SR | Silverstone Temjin TJ07 | Zalman CNPS9700 NT | 3DMark06: 9705

Good advice, thanks!