I've logged hundreds of hours with SketchUp and now all of a sudden, when I try to open the program, it looks like it is opening a new model, but then suddenly crashes with a Bug Splat.

The day before, I had a glitch. My model went out of Perspective mode with a misplaced random keystroke. But when I tried to go to the menu and put it back to Perspective, nothing would happen. It stayed in isometric mode.

Other files were working fine so I opened a new file, copied the whole model and pasted it in the new file. That was tedious because the file was large.

It was after this session when I tried to use sketchup again, that it crashed right away.

I've tried uninstalling it, downloading and installing a new version. No luck.
I've done a disk cleanup, deep virus scan, and defrag. Still no luck.
I've downloaded yet another version and done a Repair. Still no luck.

I NEED SketchUp, what do I do? Please help. THX