|You put Vista II (Windows7) on a used Dell huh? Hmmmm....|
How old is it? Laptop / Desktop? Model #?
Freezing is usually a sign of a hardware issue.
- You could check Windows Event log for errors, if you can even get into Windows, regular Mode or Safe Mode.
- Check your MOBO for bad capacitors: http://www.thenakedpc.com/dan/Bulgi...
- You could possibly try the Dell Diagnostics (boot to Dell Drivers & Utilities CD, or d/l it off Dell's site & make a bootable CD via an *.iso) as well to test the hardware.
Freezing could be a wide range of things: overheating (bad fans), bad motherboard, loose CPUs/heat sinks, bad RAM, hard drive, video card, CD/DVD ROM drive, Power Supply, bad cable connection(s), corrupt OS, virus, etc.
I've even seen a Dell laptop freeze up due to a tiny little defective modem card.
Post back with the results.
Just another stupid saying...