A computer requires care and attention. Here are some advice to avoid problems:
1.Leave the computer ON permanently. Do not turn OFF your computer for only one or two hours, even if you don't use it.
2. Protect your computer from overvoltage.
3. Test the disk at least once a year (use ScanDisk).
4. Use defragmentation utilities.
5. Save your work regularly on non rewritable media (CDs, DVDs...).
6. Use an updated antivirus.