If it is a 10k drive, it should be a 160 or above.
Switching to serial ATA will show no significant gain in speed.
You may gain a lot more hard drive space.
My suggestion would be to get a large serial ATA drive and use it for your installed programs/storage.
Use the SCSI drive for Windows.
Looking at your thread, the card and adapter are U2W with an 80MB/s interface speed. Likely throughput from the drive will be in the 40MB/s range. If the other devices are hung on the same interface, performance will be even lower as SE devices will hinder performance. Yes, going to SATA will help your speeds. Not by an insane amount, but it will be a bit faster nonetheless.