So windows 7 work on HP DV5t perfectly fine? no problems like windows xp?
It should! I ran Win7 on my former DV2404ca (Build 6956 & 7000) and it worked AMAZINGLY well.
Note: Some drivers you'll still need (just use the appropriate 32/64-bit Vista drivers).
Also Archive you data; especially your recovery CD/DVD because if you don't like Win7 you'll want to bring back your unit ot factory shipment settings.
Win7 ran much more responsive in ALL tasks on the DV2404ca (AMD 1.7Ghz TK-53 Athlon X2 cpu, 2.5GB RAM, 160HDD, and 6150GeForce video chip set to 128MB in BIOS).