corrupt driver or system file or corruption of HDD.
Can you get to safe mode?
If you can then try this
To start System File Checker, follow these steps: 1. Click Start, point to Programs, point to Accessories, point to System Tools, click System Information, and then click System File Checker on the Tools menu. 2. Click one of the following options: Scan For Altered Files Extract One File From Installation Disk NOTE: If you click Extract One File From Installation Disk, you can specify the file you want to extract.
3. Click Settings, choose the configuration you want to use in System File Checker Settings, click OK, and then click Start. For additional information about how to use the System Information tool in Windows 98, click the article number below to view the article in the Microsoft Knowledge Base: