You mention 608 MB of Ram and then you mention 128 DDR. Could you explain this? You can get 608 MB only if you have 2 modules, one of 128 and the other of 512MB (640 MB together) and 32 MB of that is used by an on-board video card. You can get the same result from having 3 modules, 128 MB each. The 128 DDR is not clear to me.
Anyway, to speed-up your computer do the following (For most downloads use links in my signature).
1: Click Start > run. Type msconfig. Go to the "startup" tab and un-check everything which is not essential to run in the background. Leave only anti-malware programs running. (if you change your mind latter you can reactivate those programs). Confirm and reboot. Upon rebooting a message will show up. Please check it and continue. For laptop users: do not uncheck items that clearly relate to the operation of the computer.
2: Download and install CCleaner. Do not install the Yahoo toolbar that comes packed with the program. Run the "cleaner" and "registry" options a number of times until nothing is left to be cleaned. Use the backup option (in "registry") when prompted to do so.
3: Run a thorough scan with updated antimalware programs. Use the link in my signature to the malware forum and follow all the preliminary steps. Run full system scans (all files), preferably in safe mode. Run the programs one at a time,
4: Run disk defragmantation. For this operation I use Auslogic Disk Defrag.
5: Download and run PageDefrag. This program defrags registry and page files which are not defragged by other means. Set it to work upon next boot and reboot.
6: Press ctr+alt+del to enter task manager. Under Performance tab look for "physical memory". Please report Total and Available.
7: Enter "My Computer", right-click drive C: -> Properties. Please report Capacity and Free Space of your hard disk (each partition, if you have more then one).
8: Go to Device Manager, expand IDE ATA/ATAPI Controllers, Double click IDE Primary Channel, click Advanced Settings and write down what you see in Current Transfer Mode. Repeat the procedure for Secondary IDE Channel.