I'm running Win7 on my Dell XPS M1530 laptop.
Recently the system has been freezing occasionally. But the interesting thing is that it still responds a few minutes after the freeze.
For example, the display dims itself after a few inactive minutes according to the power plan, and clicking a button restores the brightness.
After a few minutes it's totally unresponsive. The fan keeps spinning all the time.
It seems that the freeze happens when there is some excessive load on the system, but nothing that it hasn't endured before.
I checked the temperatures with CPUID Monitor. Nothing irregular happens at the moment of freeze.
Have you run chkdsk? I'd try that with the /f option and also defrag the hard drive if it hasn't been done in a while. Also, make sure you have at least 10% or more of free space on the drive. Once your system drive gets above 80% full, things tend to slow down.
Does anything look out of the oridinary in the event viewer?
I have less than 10% of free space, but it's been like this for years and nothing like this happened before.
Checkdisk didn't help. Nothing worth mentioning in the Event Viewer.
There is a faulty device in Device Manager, I disabled it but it didn't help.