I wholeheartedly recommend MythTV, and any Linux distribution that makes MythTV usage easier (Mythbuntu, MythDora etc). If you HAVE to be on Windows (and you really don't if the issue is drivers), the next best thing is MediaPortal.
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Main
AMD Athlon X2 5200+ 2.7GHz | 3GB DDR2-800 | ASUS M2N-SLI Deluxe | 2x Albatron GeForce 8500 GT 256MB | Creative SoundBlaster Live! 5.1 | Creative Inspire P5800 5.1 | 510W Power Supply | Ubuntu 9.10 and Windows 7
Server
2x Intel Xeon Dual-Core 2.4GHz | 2GB DDR-266 ECC | Dell PowerEdge 1600SC | ATI Rage XL IGP 16MB | Dell PERC 3/SC SCSI RAID Controller (146GB RAID 5) | SATA RAID Controller (500GB RAID 5) | Redundant Power Supplies | CentOS 5.4