1. Save your files.
2. Try other restore points. Getting it booted to use a restore point is far beyond what I can write here. The link and content I offered about XP install from Sony is used along with diskettes, the XP CD and often some USB DVDRW and Floppy Drive to perform the recovery. This is now consider far too much to ask of users today.
3. See step 1 then move it up to Windows 7.
After Windows update requiring reboot, I get:
BSOD STOP 0x0000007B
immediately after Windows logo screen.
Tried different boot options;
safe, last working config etc to no avail.
BSOD after logo, in every case.
Disk tests OK, No virus found.
Windows XP Professional SP 3, Sony Vaio laptop,
no peripherals connected during boot attempts.
Helpful tips, suggestions, ideas much appreciated.