the minimum spec for Vegas is as follows

Supported OS:Windows XP (only)
Processor: P4 3Ghz or AMD equivalent
RAM: 1024 Mb
Video Card: 128MB, Shader Model 3 and DirectX 9.0c compatible  
Sound Card: DirectX 9.0c compatible
DirectX Version: DirectX 9.0c

My Comp is as follows

Processor: Sempron 2600+ overclocked to 178/36 bus (Running@2Ghz instead of 1.8Ghz) (Socket A)
Ram: 1.3Gb
G/Card: GeForce 7600GS 256Mb AGP 8x
Sound: Onboard ASUS Motherboard

i dont want all the settings maxed out and ill probably only have it on 1024x768 resolution, but i dont want it to jerk

personally i think it will run, R6 Lockdown demo plays perfectly as does Ghost Recon

ive seen an Athlon XP 2600+ on Ebay going for Ã,£20

worth a go, although note that sempr0n is slightly slower clock for clock than a full fledged athlon due to the cache size on chip.

anyone else ?